165884016551 has 8 divisors (see below), whose sum is σ = 181031116944. Its totient is φ = 150748038720.

The previous prime is 165884016533. The next prime is 165884016553. The reversal of 165884016551 is 155610488561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165884016551 - 2²² = 165879822247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165884016551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165884016553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2749436 + ... + 2809121.

It is an arithmetic number, because the mean of its divisors is an integer number (22628889618).

Almost surely, 2^165884016551 is an apocalyptic number.

165884016551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165884016551 is a deficient number, since it is larger than the sum of its proper divisors (15147100393).

165884016551 is a wasteful number, since it uses less digits than its factorization.

165884016551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561281.

The product of its (nonzero) digits is 1152000, while the sum is 50.

The spelling of 165884016551 in words is "one hundred sixty-five billion, eight hundred eighty-four million, sixteen thousand, five hundred fifty-one".