165510661151 has 16 divisors (see below), whose sum is σ = 190179187200. Its totient is φ = 142455744000.

The previous prime is 165510661103. The next prime is 165510661157. The reversal of 165510661151 is 151166015561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 165510661151 - 2¹⁸ = 165510399007 is a prime.

It is a super-2 number, since 2×165510661151² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165510661157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87290 + ... + 581928.

It is an arithmetic number, because the mean of its divisors is an integer number (11886199200).

Almost surely, 2^165510661151 is an apocalyptic number.

165510661151 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165510661151 is a deficient number, since it is larger than the sum of its proper divisors (24668526049).

165510661151 is a wasteful number, since it uses less digits than its factorization.

165510661151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496270.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 165510661151 in words is "one hundred sixty-five billion, five hundred ten million, six hundred sixty-one thousand, one hundred fifty-one".