64636049536 has 64 divisors (see below), whose sum is σ = 139916908800. Its totient is φ = 29629393920.

The previous prime is 64636049521. The next prime is 64636049539. The reversal of 64636049536 is 63594063646.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (64636049539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353275 + ... + 504058.

It is an arithmetic number, because the mean of its divisors is an integer number (2186201700).

Almost surely, 2^64636049536 is an apocalyptic number.

It is an amenable number.

64636049536 is an abundant number, since it is smaller than the sum of its proper divisors (75280859264).

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

64636049536 is a wasteful number, since it uses less digits than its factorization.

64636049536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857397 (or 857385 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 52.

The spelling of 64636049536 in words is "sixty-four billion, six hundred thirty-six million, forty-nine thousand, five hundred thirty-six".