165313551 has 16 divisors (see below), whose sum is σ = 237665120. Its totient is φ = 101606400.

The previous prime is 165313549. The next prime is 165313591. The reversal of 165313551 is 155313561.

It is not a de Polignac number, because 165313551 - 2¹ = 165313549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165313531) 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, 37251 + ... + 41451.

It is an arithmetic number, because the mean of its divisors is an integer number (14854070).

Almost surely, 2^165313551 is an apocalyptic number.

165313551 is a deficient number, since it is larger than the sum of its proper divisors (72351569).

165313551 is a wasteful number, since it uses less digits than its factorization.

165313551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5226.

The product of its digits is 6750, while the sum is 30.

The square root of 165313551 is about 12857.4317419926. The cubic root of 165313551 is about 548.8278629938.

The spelling of 165313551 in words is "one hundred sixty-five million, three hundred thirteen thousand, five hundred fifty-one".