165497015651 has 6 divisors (see below), whose sum is σ = 181909942956. Its totient is φ = 150451832300.

The previous prime is 165497015623. The next prime is 165497015669. The reversal of 165497015651 is 156510794561.

It is not a de Polignac number, because 165497015651 - 2¹⁸ = 165496753507 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 165497015651.

It is not an unprimeable number, because it can be changed into a prime (165497015851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 683871845 + ... + 683872086.

It is an arithmetic number, because the mean of its divisors is an integer number (30318323826).

Almost surely, 2^165497015651 is an apocalyptic number.

165497015651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165497015651 is a deficient number, since it is larger than the sum of its proper divisors (16412927305).

165497015651 is a wasteful number, since it uses less digits than its factorization.

165497015651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367743953 (or 1367743942 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 50.

The spelling of 165497015651 in words is "one hundred sixty-five billion, four hundred ninety-seven million, fifteen thousand, six hundred fifty-one".