165542478 has 16 divisors (see below), whose sum is σ = 348510720. Its totient is φ = 52276536.

The previous prime is 165542453. The next prime is 165542537. The reversal of 165542478 is 874245561.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725950 + ... + 726177.

It is an arithmetic number, because the mean of its divisors is an integer number (21781920).

Almost surely, 2^165542478 is an apocalyptic number.

165542478 is an abundant number, since it is smaller than the sum of its proper divisors (182968242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165542478 is a wasteful number, since it uses less digits than its factorization.

165542478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452151.

The product of its digits is 268800, while the sum is 42.

The square root of 165542478 is about 12866.3311787005. The cubic root of 165542478 is about 549.0810859625.

The spelling of 165542478 in words is "one hundred sixty-five million, five hundred forty-two thousand, four hundred seventy-eight".