165673857 has 16 divisors (see below), whose sum is σ = 234480960. Its totient is φ = 103690752.

The previous prime is 165673847. The next prime is 165673867. The reversal of 165673857 is 758376561.

It is an interprime number because it is at equal distance from previous prime (165673847) and next prime (165673867).

It is not a de Polignac number, because 165673857 - 2⁶ = 165673793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165673817) 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, 17493 + ... + 25245.

It is an arithmetic number, because the mean of its divisors is an integer number (14655060).

Almost surely, 2^165673857 is an apocalyptic number.

165673857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

165673857 is a deficient number, since it is larger than the sum of its proper divisors (68807103).

165673857 is a wasteful number, since it uses less digits than its factorization.

165673857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8192.

The product of its digits is 1058400, while the sum is 48.

The square root of 165673857 is about 12871.4357008067. The cubic root of 165673857 is about 549.2263027669.

The spelling of 165673857 in words is "one hundred sixty-five million, six hundred seventy-three thousand, eight hundred fifty-seven".