66015060515615 has 16 divisors (see below), whose sum is σ = 79623580151808. Its totient is φ = 52542009282336.

The previous prime is 66015060515539. The next prime is 66015060515633. The reversal of 66015060515615 is 51651506051066.

It is a cyclic number.

It is not a de Polignac number, because 66015060515615 - 2²⁰ = 66015059467039 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66015060515615.

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, 16935629 + ... + 20465718.

It is an arithmetic number, because the mean of its divisors is an integer number (4976473759488).

Almost surely, 2^{66015060515615} is an apocalyptic number.

66015060515615 is a deficient number, since it is larger than the sum of its proper divisors (13608519636193).

66015060515615 is a wasteful number, since it uses less digits than its factorization.

66015060515615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37403158.

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 66015060515615 in words is "sixty-six trillion, fifteen billion, sixty million, five hundred fifteen thousand, six hundred fifteen".