64938049536 has 152 divisors (see below), whose sum is σ = 175757779584. Its totient is φ = 21322792960.

The previous prime is 64938049531. The next prime is 64938049541. The reversal of 64938049536 is 63594083946.

It is an interprime number because it is at equal distance from previous prime (64938049531) and next prime (64938049541).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64938049531) 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, 55836091 + ... + 55837253.

Almost surely, 2^64938049536 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 64938049536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87878889792).

64938049536 is an abundant number, since it is smaller than the sum of its proper divisors (110819730048).

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

64938049536 is an frugal number, since it uses more digits than its factorization.

64938049536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273 (or 1239 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 57.

The spelling of 64938049536 in words is "sixty-four billion, nine hundred thirty-eight million, forty-nine thousand, five hundred thirty-six".