165212540 has 12 divisors (see below), whose sum is σ = 346946376. Its totient is φ = 66085008.

The previous prime is 165212503. The next prime is 165212557. The reversal of 165212540 is 45212561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4130294 + ... + 4130333.

It is an arithmetic number, because the mean of its divisors is an integer number (28912198).

Almost surely, 2^165212540 is an apocalyptic number.

165212540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165212540 is an abundant number, since it is smaller than the sum of its proper divisors (181733836).

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

165212540 is a wasteful number, since it uses less digits than its factorization.

165212540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8260636 (or 8260634 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 165212540 is about 12853.5030244677. The cubic root of 165212540 is about 548.7160573855.

The spelling of 165212540 in words is "one hundred sixty-five million, two hundred twelve thousand, five hundred forty".