64866492438 has 32 divisors (see below), whose sum is σ = 146092280832. Its totient is φ = 19022431200.

The previous prime is 64866492433. The next prime is 64866492553. The reversal of 64866492438 is 83429466846.

It is a super-2 number, since 2×64866492438² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64866492433) 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, 15849981 + ... + 15854072.

It is an arithmetic number, because the mean of its divisors is an integer number (4565383776).

Almost surely, 2^64866492438 is an apocalyptic number.

64866492438 is an abundant number, since it is smaller than the sum of its proper divisors (81225788394).

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

64866492438 is a wasteful number, since it uses less digits than its factorization.

64866492438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31704100.

The product of its digits is 47775744, while the sum is 60.

The spelling of 64866492438 in words is "sixty-four billion, eight hundred sixty-six million, four hundred ninety-two thousand, four hundred thirty-eight".