166165101011651 has 4 divisors (see below), whose sum is σ = 189902972584752. Its totient is φ = 142427229438552.

The previous prime is 166165101011641. The next prime is 166165101011771. The reversal of 166165101011651 is 156110101561661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166165101011651 - 2³⁸ = 165890223104707 is a prime.

It is a super-2 number, since 2×166165101011651² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166165101011599 and 166165101011608.

It is not an unprimeable number, because it can be changed into a prime (166165101011641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11868935786540 + ... + 11868935786553.

It is an arithmetic number, because the mean of its divisors is an integer number (47475743146188).

Almost surely, 2^{166165101011651} is an apocalyptic number.

166165101011651 is a deficient number, since it is larger than the sum of its proper divisors (23737871573101).

166165101011651 is an equidigital number, since it uses as much as digits as its factorization.

166165101011651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23737871573100.

The product of its (nonzero) digits is 32400, while the sum is 41.

The spelling of 166165101011651 in words is "one hundred sixty-six trillion, one hundred sixty-five billion, one hundred one million, eleven thousand, six hundred fifty-one".