165478957 has 4 divisors (see below), whose sum is σ = 189118816. Its totient is φ = 141839100.

The previous prime is 165478949. The next prime is 165478967. The reversal of 165478957 is 759874561.

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.

It is a cyclic number.

It is not a de Polignac number, because 165478957 - 2³ = 165478949 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 (165478967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11819919 + ... + 11819932.

It is an arithmetic number, because the mean of its divisors is an integer number (47279704).

Almost surely, 2^165478957 is an apocalyptic number.

It is an amenable number.

165478957 is a deficient number, since it is larger than the sum of its proper divisors (23639859).

165478957 is an equidigital number, since it uses as much as digits as its factorization.

165478957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23639858.

The product of its digits is 2116800, while the sum is 52.

The square root of 165478957 is about 12863.8624448491. The cubic root of 165478957 is about 549.0108469074.

The spelling of 165478957 in words is "one hundred sixty-five million, four hundred seventy-eight thousand, nine hundred fifty-seven".