664612568854 has 64 divisors (see below), whose sum is σ = 1103674985280. Its totient is φ = 298281553920.

The previous prime is 664612568843. The next prime is 664612568861. The reversal of 664612568854 is 458865216466.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a junction number, because it is equal to n+sod(n) for n = 664612568792 and 664612568801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73295629 + ... + 73304695.

It is an arithmetic number, because the mean of its divisors is an integer number (17244921645).

Almost surely, 2^664612568854 is an apocalyptic number.

664612568854 is a deficient number, since it is larger than the sum of its proper divisors (439062416426).

664612568854 is a wasteful number, since it uses less digits than its factorization.

664612568854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9665.

The product of its digits is 66355200, while the sum is 61.

The spelling of 664612568854 in words is "six hundred sixty-four billion, six hundred twelve million, five hundred sixty-eight thousand, eight hundred fifty-four".