64120038615 has 40 divisors (see below), whose sum is σ = 115995691680. Its totient is φ = 33883593408.

The previous prime is 64120038607. The next prime is 64120038673. The reversal of 64120038615 is 51683002146.

It is a happy number.

64120038615 is a `hidden beast` number, since 6 + 4 + 1 + 2 + 0 + 0 + 38 + 615 = 666.

It is not a de Polignac number, because 64120038615 - 2³ = 64120038607 is a prime.

It is a super-2 number, since 2×64120038615² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64120038615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 682099 + ... + 770388.

It is an arithmetic number, because the mean of its divisors is an integer number (2899892292).

Almost surely, 2^64120038615 is an apocalyptic number.

64120038615 is a deficient number, since it is larger than the sum of its proper divisors (51875653065).

64120038615 is a wasteful number, since it uses less digits than its factorization.

64120038615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452613 (or 1452604 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 64120038615 in words is "sixty-four billion, one hundred twenty million, thirty-eight thousand, six hundred fifteen".