166155605566051 has 4 divisors (see below), whose sum is σ = 166194895143600. Its totient is φ = 166116315988504.

The previous prime is 166155605566021. The next prime is 166155605566117. The reversal of 166155605566051 is 150665506551661.

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 166155605566051 - 2³³ = 166147015631459 is a prime.

It is a super-2 number, since 2×166155605566051² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166155605566021) 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, 19644782431 + ... + 19644790888.

It is an arithmetic number, because the mean of its divisors is an integer number (41548723785900).

Almost surely, 2^{166155605566051} is an apocalyptic number.

166155605566051 is a deficient number, since it is larger than the sum of its proper divisors (39289577549).

166155605566051 is an equidigital number, since it uses as much as digits as its factorization.

166155605566051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39289577548.

The product of its (nonzero) digits is 24300000, while the sum is 58.

The spelling of 166155605566051 in words is "one hundred sixty-six trillion, one hundred fifty-five billion, six hundred five million, five hundred sixty-six thousand, fifty-one".