189765197655 has 64 divisors (see below), whose sum is σ = 341029979136. Its totient is φ = 89307008000.

The previous prime is 189765197647. The next prime is 189765197693. The reversal of 189765197655 is 556791567981.

It is not a de Polignac number, because 189765197655 - 2³ = 189765197647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189765197655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1261510 + ... + 1403900.

It is an arithmetic number, because the mean of its divisors is an integer number (5328593424).

Almost surely, 2^189765197655 is an apocalyptic number.

189765197655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

189765197655 is a deficient number, since it is larger than the sum of its proper divisors (151264781481).

189765197655 is a wasteful number, since it uses less digits than its factorization.

189765197655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142648.

The product of its digits is 142884000, while the sum is 69.

The spelling of 189765197655 in words is "one hundred eighty-nine billion, seven hundred sixty-five million, one hundred ninety-seven thousand, six hundred fifty-five".