664860354658 has 16 divisors (see below), whose sum is σ = 999714207744. Its totient is φ = 331622799840.

The previous prime is 664860354583. The next prime is 664860354679. The reversal of 664860354658 is 856453068466.

It is a junction number, because it is equal to n+sod(n) for n = 664860354596 and 664860354605.

It is an unprimeable number.

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, 2490118 + ... + 2744158.

It is an arithmetic number, because the mean of its divisors is an integer number (62482137984).

Almost surely, 2^664860354658 is an apocalyptic number.

664860354658 is a deficient number, since it is larger than the sum of its proper divisors (334853853086).

664860354658 is a wasteful number, since it uses less digits than its factorization.

664860354658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257217.

The product of its (nonzero) digits is 99532800, while the sum is 61.

The spelling of 664860354658 in words is "six hundred sixty-four billion, eight hundred sixty million, three hundred fifty-four thousand, six hundred fifty-eight".