165634540 has 24 divisors (see below), whose sum is σ = 354397680. Its totient is φ = 65003328.

The previous prime is 165634531. The next prime is 165634561. The reversal of 165634540 is 45436561.

It is a junction number, because it is equal to n+sod(n) for n = 165634496 and 165634505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77070 + ... + 79189.

It is an arithmetic number, because the mean of its divisors is an integer number (14766570).

Almost surely, 2^165634540 is an apocalyptic number.

165634540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165634540 is an abundant number, since it is smaller than the sum of its proper divisors (188763140).

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

165634540 is a wasteful number, since it uses less digits than its factorization.

165634540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156321 (or 156319 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 165634540 is about 12869.9083135817. The cubic root of 165634540 is about 549.1828526628.

The spelling of 165634540 in words is "one hundred sixty-five million, six hundred thirty-four thousand, five hundred forty".