664838653634 has 32 divisors (see below), whose sum is σ = 1074336384000. Its totient is φ = 307548665424.

The previous prime is 664838653631. The next prime is 664838653639. The reversal of 664838653634 is 436356838466.

It is a happy number.

664838653634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (664838653631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10883027 + ... + 10943945.

It is an arithmetic number, because the mean of its divisors is an integer number (33573012000).

Almost surely, 2^664838653634 is an apocalyptic number.

664838653634 is a deficient number, since it is larger than the sum of its proper divisors (409497730366).

664838653634 is a wasteful number, since it uses less digits than its factorization.

664838653634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67662.

The product of its digits is 179159040, while the sum is 62.

The spelling of 664838653634 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, six hundred fifty-three thousand, six hundred thirty-four".