166156507220007 has 4 divisors (see below), whose sum is σ = 221542009626680. Its totient is φ = 110771004813336.

The previous prime is 166156507219951. The next prime is 166156507220017. The reversal of 166156507220007 is 700022705651661.

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

It is not a de Polignac number, because 166156507220007 - 2⁸ = 166156507219751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166156507220017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27692751203332 + ... + 27692751203337.

It is an arithmetic number, because the mean of its divisors is an integer number (55385502406670).

Almost surely, 2^{166156507220007} is an apocalyptic number.

166156507220007 is a deficient number, since it is larger than the sum of its proper divisors (55385502406673).

166156507220007 is an equidigital number, since it uses as much as digits as its factorization.

166156507220007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55385502406672.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 166156507220007 in words is "one hundred sixty-six trillion, one hundred fifty-six billion, five hundred seven million, two hundred twenty thousand, seven".