165757947 has 4 divisors (see below), whose sum is σ = 221010600. Its totient is φ = 110505296.

The previous prime is 165757937. The next prime is 165757951. The reversal of 165757947 is 749757561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165757947 - 2⁶ = 165757883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165757947.

It is not an unprimeable number, because it can be changed into a prime (165757937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27626322 + ... + 27626327.

It is an arithmetic number, because the mean of its divisors is an integer number (55252650).

Almost surely, 2^165757947 is an apocalyptic number.

165757947 is a deficient number, since it is larger than the sum of its proper divisors (55252653).

165757947 is an equidigital number, since it uses as much as digits as its factorization.

165757947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55252652.

The product of its digits is 1852200, while the sum is 51.

The square root of 165757947 is about 12874.7018217899. The cubic root of 165757947 is about 549.3192094551.

The spelling of 165757947 in words is "one hundred sixty-five million, seven hundred fifty-seven thousand, nine hundred forty-seven".