66155156506015 has 32 divisors (see below), whose sum is σ = 80931820032000. Its totient is φ = 51898173452928.

The previous prime is 66155156505967. The next prime is 66155156506031. The reversal of 66155156506015 is 51060565155166.

It is a cyclic number.

It is not a de Polignac number, because 66155156506015 - 2⁴¹ = 63956133250463 is a prime.

It is a congruent number.

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, 2017093597 + ... + 2017126393.

It is an arithmetic number, because the mean of its divisors is an integer number (2529119376000).

Almost surely, 2^{66155156506015} is an apocalyptic number.

66155156506015 is a deficient number, since it is larger than the sum of its proper divisors (14776663525985).

66155156506015 is a wasteful number, since it uses less digits than its factorization.

66155156506015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49599.

The product of its (nonzero) digits is 4050000, while the sum is 52.

The spelling of 66155156506015 in words is "sixty-six trillion, one hundred fifty-five billion, one hundred fifty-six million, five hundred six thousand, fifteen".