165057901 has 4 divisors (see below), whose sum is σ = 165110400. Its totient is φ = 165005404.

The previous prime is 165057877. The next prime is 165057967. The reversal of 165057901 is 109750561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 109750561 = 59 ⋅1860179.

It is a cyclic number.

It is not a de Polignac number, because 165057901 - 2¹⁹ = 164533613 is a prime.

It is a super-2 number, since 2×165057901² = 54488221365051602, which 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 (165057001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21211 + ... + 27928.

It is an arithmetic number, because the mean of its divisors is an integer number (41277600).

Almost surely, 2^165057901 is an apocalyptic number.

It is an amenable number.

165057901 is a deficient number, since it is larger than the sum of its proper divisors (52499).

165057901 is an equidigital number, since it uses as much as digits as its factorization.

165057901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52498.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 165057901 is about 12847.4861743455. The cubic root of 165057901 is about 548.5448044643.

The spelling of 165057901 in words is "one hundred sixty-five million, fifty-seven thousand, nine hundred one".