66517260915 has 32 divisors (see below), whose sum is σ = 123297762816. Its totient is φ = 29991340800.

The previous prime is 66517260893. The next prime is 66517260919. The reversal of 66517260915 is 51906271566.

It is not a de Polignac number, because 66517260915 - 2⁶ = 66517260851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66517260919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4331361 + ... + 4346690.

It is an arithmetic number, because the mean of its divisors is an integer number (3853055088).

Almost surely, 2^66517260915 is an apocalyptic number.

66517260915 is a deficient number, since it is larger than the sum of its proper divisors (56780501901).

66517260915 is a wasteful number, since it uses less digits than its factorization.

66517260915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8678139.

The product of its (nonzero) digits is 680400, while the sum is 48.

The spelling of 66517260915 in words is "sixty-six billion, five hundred seventeen million, two hundred sixty thousand, nine hundred fifteen".