165138457 has 16 divisors (see below), whose sum is σ = 186753024. Its totient is φ = 144666000.

The previous prime is 165138373. The next prime is 165138461. The reversal of 165138457 is 754831561.

It is a happy number.

165138457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 165138457 - 2²³ = 156749849 is a prime.

It is a Duffinian number.

Its product of digits (100800) is a multiple of the sum of its prime divisors (2100).

It is not an unprimeable number, because it can be changed into a prime (165138497) 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, 91518 + ... + 93304.

It is an arithmetic number, because the mean of its divisors is an integer number (11672064).

Almost surely, 2^165138457 is an apocalyptic number.

It is an amenable number.

165138457 is a deficient number, since it is larger than the sum of its proper divisors (21614567).

165138457 is a wasteful number, since it uses less digits than its factorization.

165138457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100.

The product of its digits is 100800, while the sum is 40.

The square root of 165138457 is about 12850.6208799419. The cubic root of 165138457 is about 548.6340284846.

The spelling of 165138457 in words is "one hundred sixty-five million, one hundred thirty-eight thousand, four hundred fifty-seven".