64469638536 has 64 divisors (see below), whose sum is σ = 166953441600. Its totient is φ = 20721270528.

The previous prime is 64469638501. The next prime is 64469638547. The reversal of 64469638536 is 63583696446.

It is a self number, because there is not a number n which added to its sum of digits gives 64469638536.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465691 + ... + 588053.

It is an arithmetic number, because the mean of its divisors is an integer number (2608647525).

Almost surely, 2^64469638536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64469638536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83476720800).

64469638536 is an abundant number, since it is smaller than the sum of its proper divisors (102483803064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64469638536 is a wasteful number, since it uses less digits than its factorization.

64469638536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123158 (or 123154 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 60.

The spelling of 64469638536 in words is "sixty-four billion, four hundred sixty-nine million, six hundred thirty-eight thousand, five hundred thirty-six".