165664927051 has 16 divisors (see below), whose sum is σ = 178688284768. Its totient is φ = 152681760000.

The previous prime is 165664927037. The next prime is 165664927061. The reversal of 165664927051 is 150729466561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 165664927051 - 2¹⁹ = 165664402763 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 165664927051.

It is not an unprimeable number, because it can be changed into a prime (165664927031) 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, 32474401 + ... + 32479501.

It is an arithmetic number, because the mean of its divisors is an integer number (11168017798).

Almost surely, 2^165664927051 is an apocalyptic number.

165664927051 is a deficient number, since it is larger than the sum of its proper divisors (13023357717).

165664927051 is a wasteful number, since it uses less digits than its factorization.

165664927051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8542.

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 165664927051 in words is "one hundred sixty-five billion, six hundred sixty-four million, nine hundred twenty-seven thousand, fifty-one".