660060378481 has 27 divisors (see below), whose sum is σ = 772450825419. Its totient is φ = 562378159728.

The previous prime is 660060378451. The next prime is 660060378487. The reversal of 660060378481 is 184873060066.

The square root of 660060378481 is 812441.

It is a perfect power (a square), and thus also a powerful number.

660060378481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 113767917025 + 546292461456 = 337295^2 + 739116^2 .

It is not a de Polignac number, because 660060378481 - 2¹³ = 660060370289 is a prime.

It is a super-2 number, since 2×660060378481² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (660060378487) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1575322890 + ... + 1575323308.

Almost surely, 2^660060378481 is an apocalyptic number.

660060378481 is the 812441-st square number.

660060378481 is the 406221-st centered octagonal number.

It is an amenable number.

660060378481 is a deficient number, since it is larger than the sum of its proper divisors (112390446938).

660060378481 is an frugal number, since it uses more digits than its factorization.

660060378481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 49.

Multiplying 660060378481 by its sum of digits (49), we get a square (32342958545569 = 5687087²).

660060378481 divided by its sum of digits (49) gives a square (13470619969 = 116063²).

The spelling of 660060378481 in words is "six hundred sixty billion, sixty million, three hundred seventy-eight thousand, four hundred eighty-one".