165855554750 has 64 divisors (see below), whose sum is σ = 313205667840. Its totient is φ = 65761113600.

The previous prime is 165855554749. The next prime is 165855554791. The reversal of 165855554750 is 57455558561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59466356 + ... + 59469144.

It is an arithmetic number, because the mean of its divisors is an integer number (4893838560).

Almost surely, 2^165855554750 is an apocalyptic number.

165855554750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165855554750 is a deficient number, since it is larger than the sum of its proper divisors (147350113090).

165855554750 is a wasteful number, since it uses less digits than its factorization.

165855554750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4806 (or 4796 counting only the distinct ones).

The product of its (nonzero) digits is 21000000, while the sum is 56.

The spelling of 165855554750 in words is "one hundred sixty-five billion, eight hundred fifty-five million, five hundred fifty-four thousand, seven hundred fifty".