165722520155 has 4 divisors (see below), whose sum is σ = 198867024192. Its totient is φ = 132578016120.

The previous prime is 165722520113. The next prime is 165722520179. The reversal of 165722520155 is 551025227561.

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

It is not a de Polignac number, because 165722520155 - 2¹⁸ = 165722258011 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16572252011 + ... + 16572252020.

It is an arithmetic number, because the mean of its divisors is an integer number (49716756048).

Almost surely, 2^165722520155 is an apocalyptic number.

165722520155 is a deficient number, since it is larger than the sum of its proper divisors (33144504037).

165722520155 is an equidigital number, since it uses as much as digits as its factorization.

165722520155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33144504036.

The product of its (nonzero) digits is 210000, while the sum is 41.

The spelling of 165722520155 in words is "one hundred sixty-five billion, seven hundred twenty-two million, five hundred twenty thousand, one hundred fifty-five".