64999999915 has 8 divisors (see below), whose sum is σ = 79813953648. Its totient is φ = 50790697440.

The previous prime is 64999999871. The next prime is 64999999927. The reversal of 64999999915 is 51999999946.

64999999915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64999999915 - 2¹³ = 64999991723 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151162576 + ... + 151163005.

It is an arithmetic number, because the mean of its divisors is an integer number (9976744206).

Almost surely, 2^64999999915 is an apocalyptic number.

64999999915 is a deficient number, since it is larger than the sum of its proper divisors (14813953733).

64999999915 is a wasteful number, since it uses less digits than its factorization.

64999999915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302325629.

The product of its digits is 573956280, while the sum is 79.

The spelling of 64999999915 in words is "sixty-four billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifteen".