166155161515015 has 128 divisors (see below), whose sum is σ = 223223586600960. Its totient is φ = 118209457766400.

The previous prime is 166155161514997. The next prime is 166155161515129. The reversal of 166155161515015 is 510515161551661.

It is a happy number.

It is not a de Polignac number, because 166155161515015 - 2¹³ = 166155161506823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166155161515015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3025541337 + ... + 3025596253.

It is an arithmetic number, because the mean of its divisors is an integer number (1743934270320).

Almost surely, 2^{166155161515015} is an apocalyptic number.

166155161515015 is a deficient number, since it is larger than the sum of its proper divisors (57068425085945).

166155161515015 is a wasteful number, since it uses less digits than its factorization.

166155161515015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55273.

The product of its (nonzero) digits is 675000, while the sum is 49.

The spelling of 166155161515015 in words is "one hundred sixty-six trillion, one hundred fifty-five billion, one hundred sixty-one million, five hundred fifteen thousand, fifteen".