660787201 has 4 divisors (see below), whose sum is σ = 676904004. Its totient is φ = 644670400.

The previous prime is 660787139. The next prime is 660787207. The reversal of 660787201 is 102787066.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45697600 + 615089601 = 6760^2 + 24801^2 .

It is a cyclic number.

It is not a de Polignac number, because 660787201 - 2⁹ = 660786689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660787207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8058340 + ... + 8058421.

It is an arithmetic number, because the mean of its divisors is an integer number (169226001).

Almost surely, 2^660787201 is an apocalyptic number.

It is an amenable number.

660787201 is a deficient number, since it is larger than the sum of its proper divisors (16116803).

660787201 is a wasteful number, since it uses less digits than its factorization.

660787201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16116802.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 660787201 is about 25705.7814703230. The cubic root of 660787201 is about 871.0047848456.

The spelling of 660787201 in words is "six hundred sixty million, seven hundred eighty-seven thousand, two hundred one".