166156507220001 has 64 divisors (see below), whose sum is σ = 235668758376960. Its totient is φ = 103905584640000.

The previous prime is 166156507219951. The next prime is 166156507220017. The reversal of 166156507220001 is 100022705651661.

It is not a de Polignac number, because 166156507220001 - 2⁷ = 166156507219873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166156507220101) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3492053031 + ... + 3492100611.

It is an arithmetic number, because the mean of its divisors is an integer number (3682324349640).

Almost surely, 2^{166156507220001} is an apocalyptic number.

It is an amenable number.

166156507220001 is a deficient number, since it is larger than the sum of its proper divisors (69512251156959).

166156507220001 is a wasteful number, since it uses less digits than its factorization.

166156507220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50138.

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 166156507220001 in words is "one hundred sixty-six trillion, one hundred fifty-six billion, five hundred seven million, two hundred twenty thousand, one".