168509057 has 16 divisors (see below), whose sum is σ = 177012864. Its totient is φ = 160272000.

The previous prime is 168509051. The next prime is 168509059. The reversal of 168509057 is 750905861.

It is a cyclic number.

It is not a de Polignac number, because 168509057 - 2⁶ = 168508993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168509051) 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, 311207 + ... + 311747.

It is an arithmetic number, because the mean of its divisors is an integer number (11063304).

Almost surely, 2^168509057 is an apocalyptic number.

It is an amenable number.

168509057 is a deficient number, since it is larger than the sum of its proper divisors (8503807).

168509057 is a wasteful number, since it uses less digits than its factorization.

168509057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 168509057 is about 12981.1038436645. The cubic root of 168509057 is about 552.3415946040.

The spelling of 168509057 in words is "one hundred sixty-eight million, five hundred nine thousand, fifty-seven".