66515315361 has 16 divisors (see below), whose sum is σ = 96765140160. Its totient is φ = 40305816320.

The previous prime is 66515315333. The next prime is 66515315413. The reversal of 66515315361 is 16351351566.

It is not a de Polignac number, because 66515315361 - 2²⁹ = 65978444449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66515315161) 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, 49621 + ... + 368093.

It is an arithmetic number, because the mean of its divisors is an integer number (6047821260).

Almost surely, 2^66515315361 is an apocalyptic number.

It is an amenable number.

66515315361 is a deficient number, since it is larger than the sum of its proper divisors (30249824799).

66515315361 is a wasteful number, since it uses less digits than its factorization.

66515315361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324816.

The product of its digits is 243000, while the sum is 42.

The spelling of 66515315361 in words is "sixty-six billion, five hundred fifteen million, three hundred fifteen thousand, three hundred sixty-one".