660464626457 has 8 divisors (see below), whose sum is σ = 662007440136. Its totient is φ = 658922239872.

The previous prime is 660464626447. The next prime is 660464626469. The reversal of 660464626457 is 754626464066.

It can be written as a sum of positive squares in 4 ways, for example, as 233401069456 + 427063557001 = 483116^2 + 653501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660464626457 - 2⁴ = 660464626441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660464626447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3101903 + ... + 3307979.

It is an arithmetic number, because the mean of its divisors is an integer number (82750930017).

Almost surely, 2^660464626457 is an apocalyptic number.

It is an amenable number.

660464626457 is a deficient number, since it is larger than the sum of its proper divisors (1542813679).

660464626457 is a wasteful number, since it uses less digits than its factorization.

660464626457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213547.

The product of its (nonzero) digits is 34836480, while the sum is 56.

The spelling of 660464626457 in words is "six hundred sixty billion, four hundred sixty-four million, six hundred twenty-six thousand, four hundred fifty-seven".