165420756436 has 72 divisors (see below), whose sum is σ = 321376132224. Its totient is φ = 74424879360.

The previous prime is 165420756401. The next prime is 165420756437. The reversal of 165420756436 is 634657024561.

165420756436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 165420756436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165420756437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65048181 + ... + 65050723.

It is an arithmetic number, because the mean of its divisors is an integer number (4463557392).

Almost surely, 2^165420756436 is an apocalyptic number.

It is an amenable number.

165420756436 is a deficient number, since it is larger than the sum of its proper divisors (155955375788).

165420756436 is a wasteful number, since it uses less digits than its factorization.

165420756436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4961 (or 4946 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 165420756436 in words is "one hundred sixty-five billion, four hundred twenty million, seven hundred fifty-six thousand, four hundred thirty-six".