165749901 has 24 divisors (see below), whose sum is σ = 240816384. Its totient is φ = 101286720.

The previous prime is 165749897. The next prime is 165749911. The reversal of 165749901 is 109947561.

It is not a de Polignac number, because 165749901 - 2² = 165749897 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165749911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31105 + ... + 36041.

It is an arithmetic number, because the mean of its divisors is an integer number (10034016).

Almost surely, 2^165749901 is an apocalyptic number.

It is an amenable number.

165749901 is a deficient number, since it is larger than the sum of its proper divisors (75066483).

165749901 is a wasteful number, since it uses less digits than its factorization.

165749901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009 (or 4990 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 165749901 is about 12874.3893447418. The cubic root of 165749901 is about 549.3103212058.

The spelling of 165749901 in words is "one hundred sixty-five million, seven hundred forty-nine thousand, nine hundred one".