66156115115 has 16 divisors (see below), whose sum is σ = 81396480000. Its totient is φ = 51590401632.

The previous prime is 66156115079. The next prime is 66156115117. The reversal of 66156115115 is 51151165166.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66156115115 - 2²⁸ = 65887679659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66156115117) 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, 201035 + ... + 415604.

It is an arithmetic number, because the mean of its divisors is an integer number (5087280000).

Almost surely, 2^66156115115 is an apocalyptic number.

66156115115 is a deficient number, since it is larger than the sum of its proper divisors (15240364885).

66156115115 is a wasteful number, since it uses less digits than its factorization.

66156115115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617186.

The product of its digits is 27000, while the sum is 38.

It can be divided in two parts, 661561 and 15115, that added together give a palindrome (676676).

The spelling of 66156115115 in words is "sixty-six billion, one hundred fifty-six million, one hundred fifteen thousand, one hundred fifteen".