664612567257 has 32 divisors (see below), whose sum is σ = 965310105600. Its totient is φ = 405131727168.

The previous prime is 664612567243. The next prime is 664612567261. The reversal of 664612567257 is 752765216466.

It is not a de Polignac number, because 664612567257 - 2¹² = 664612563161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 664612567197 and 664612567206.

It is not an unprimeable number, because it can be changed into a prime (664612567217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4501198 + ... + 4646504.

It is an arithmetic number, because the mean of its divisors is an integer number (30165940800).

Almost surely, 2^664612567257 is an apocalyptic number.

It is an amenable number.

664612567257 is a deficient number, since it is larger than the sum of its proper divisors (300697538343).

664612567257 is a wasteful number, since it uses less digits than its factorization.

664612567257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148125.

The product of its digits is 25401600, while the sum is 57.

The spelling of 664612567257 in words is "six hundred sixty-four billion, six hundred twelve million, five hundred sixty-seven thousand, two hundred fifty-seven".