165651505501 has 8 divisors (see below), whose sum is σ = 167225646080. Its totient is φ = 164081580768.

The previous prime is 165651505489. The next prime is 165651505507. The reversal of 165651505501 is 105505156561.

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 165651505501 - 2³³ = 157061570909 is a prime.

It is a super-2 number, since 2×165651505501² (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 (165651505507) 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, 974976 + ... + 1132201.

It is an arithmetic number, because the mean of its divisors is an integer number (20903205760).

Almost surely, 2^165651505501 is an apocalyptic number.

It is an amenable number.

165651505501 is a deficient number, since it is larger than the sum of its proper divisors (1574140579).

165651505501 is a wasteful number, since it uses less digits than its factorization.

165651505501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107923.

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 165651505501 in words is "one hundred sixty-five billion, six hundred fifty-one million, five hundred five thousand, five hundred one".