165153431255551 has 4 divisors (see below), whose sum is σ = 165157791319600. Its totient is φ = 165149071191504.

The previous prime is 165153431255347. The next prime is 165153431255557. The reversal of 165153431255551 is 155552134351561.

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 165153431255551 - 2⁹ = 165153431255039 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 (165153431255557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2179975206 + ... + 2180050963.

It is an arithmetic number, because the mean of its divisors is an integer number (41289447829900).

Almost surely, 2^{165153431255551} is an apocalyptic number.

165153431255551 is a deficient number, since it is larger than the sum of its proper divisors (4360064049).

165153431255551 is an equidigital number, since it uses as much as digits as its factorization.

165153431255551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360064048.

The product of its digits is 6750000, while the sum is 52.

The spelling of 165153431255551 in words is "one hundred sixty-five trillion, one hundred fifty-three billion, four hundred thirty-one million, two hundred fifty-five thousand, five hundred fifty-one".