660860481 has 4 divisors (see below), whose sum is σ = 881147312. Its totient is φ = 440573652.

The previous prime is 660860477. The next prime is 660860491. The reversal of 660860481 is 184068066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 660860481 - 2² = 660860477 is a prime.

It is a super-2 number, since 2×660860481² = 873473150695102722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660860411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110143411 + ... + 110143416.

It is an arithmetic number, because the mean of its divisors is an integer number (220286828).

Almost surely, 2^660860481 is an apocalyptic number.

It is an amenable number.

660860481 is a deficient number, since it is larger than the sum of its proper divisors (220286831).

660860481 is a wasteful number, since it uses less digits than its factorization.

660860481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220286830.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 660860481 is about 25707.2067910926. The cubic root of 660860481 is about 871.0369812276.

The spelling of 660860481 in words is "six hundred sixty million, eight hundred sixty thousand, four hundred eighty-one".