66515265215 has 16 divisors (see below), whose sum is σ = 94366486080. Its totient is φ = 44037692160.

The previous prime is 66515265199. The next prime is 66515265221. The reversal of 66515265215 is 51256251566.

It is not a de Polignac number, because 66515265215 - 2⁴ = 66515265199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32765126 + ... + 32767155.

It is an arithmetic number, because the mean of its divisors is an integer number (5897905380).

Almost surely, 2^66515265215 is an apocalyptic number.

66515265215 is a deficient number, since it is larger than the sum of its proper divisors (27851220865).

66515265215 is a wasteful number, since it uses less digits than its factorization.

66515265215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65532322.

The product of its digits is 540000, while the sum is 44.

The spelling of 66515265215 in words is "sixty-six billion, five hundred fifteen million, two hundred sixty-five thousand, two hundred fifteen".