166115611660515 has 24 divisors (see below), whose sum is σ = 292143819518544. Its totient is φ = 80540902622400.

The previous prime is 166115611660357. The next prime is 166115611660547. The reversal of 166115611660515 is 515066116511661.

It is not a de Polignac number, because 166115611660515 - 2⁸ = 166115611660259 is a prime.

It is a super-2 number, since 2×166115611660515² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45761874676 + ... + 45761878305.

It is an arithmetic number, because the mean of its divisors is an integer number (12172659146606).

Almost surely, 2^{166115611660515} is an apocalyptic number.

166115611660515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166115611660515 is a deficient number, since it is larger than the sum of its proper divisors (126028207858029).

166115611660515 is a wasteful number, since it uses less digits than its factorization.

166115611660515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91523753011 (or 91523753000 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 51.

The spelling of 166115611660515 in words is "one hundred sixty-six trillion, one hundred fifteen billion, six hundred eleven million, six hundred sixty thousand, five hundred fifteen".