165123477 has 24 divisors (see below), whose sum is σ = 250941600. Its totient is φ = 104475168.

The previous prime is 165123467. The next prime is 165123487. The reversal of 165123477 is 774321561.

It is a happy number.

165123477 is a `hidden beast` number, since 1 + 65 + 123 + 477 = 666.

It is an interprime number because it is at equal distance from previous prime (165123467) and next prime (165123487).

It is not a de Polignac number, because 165123477 - 2⁷ = 165123349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165123407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10038 + ... + 20760.

It is an arithmetic number, because the mean of its divisors is an integer number (10455900).

Almost surely, 2^165123477 is an apocalyptic number.

It is an amenable number.

165123477 is a deficient number, since it is larger than the sum of its proper divisors (85818123).

165123477 is a wasteful number, since it uses less digits than its factorization.

165123477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10817 (or 10814 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 165123477 is about 12850.0380155080. The cubic root of 165123477 is about 548.6174387969.

It can be divided in two parts, 165123 and 477, that added together give a triangular number (165600 = T₅₇₅).

The spelling of 165123477 in words is "one hundred sixty-five million, one hundred twenty-three thousand, four hundred seventy-seven".