66115066515 has 32 divisors (see below), whose sum is σ = 106724545536. Its totient is φ = 34949076480.

The previous prime is 66115066483. The next prime is 66115066529. The reversal of 66115066515 is 51566051166.

It is not a de Polignac number, because 66115066515 - 2⁵ = 66115066483 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 860475 + ... + 934155.

It is an arithmetic number, because the mean of its divisors is an integer number (3335142048).

Almost surely, 2^66115066515 is an apocalyptic number.

66115066515 is a deficient number, since it is larger than the sum of its proper divisors (40609479021).

66115066515 is a wasteful number, since it uses less digits than its factorization.

66115066515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74219.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 66115066515 in words is "sixty-six billion, one hundred fifteen million, sixty-six thousand, five hundred fifteen".