664721677126630 has 16 divisors (see below), whose sum is σ = 1199354625085680. Its totient is φ = 265254091682272.

The previous prime is 664721677126571. The next prime is 664721677126657. The reversal of 664721677126630 is 36621776127466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79322391649 + ... + 79322400028.

It is an arithmetic number, because the mean of its divisors is an integer number (74959664067855).

Almost surely, 2^{664721677126630} is an apocalyptic number.

664721677126630 is a deficient number, since it is larger than the sum of its proper divisors (534632947959050).

664721677126630 is a wasteful number, since it uses less digits than its factorization.

664721677126630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158644792103.

The product of its (nonzero) digits is 128024064, while the sum is 64.

The spelling of 664721677126630 in words is "six hundred sixty-four trillion, seven hundred twenty-one billion, six hundred seventy-seven million, one hundred twenty-six thousand, six hundred thirty".