189855145779 has 32 divisors (see below), whose sum is σ = 277182259200. Its totient is φ = 114876869760.

The previous prime is 189855145769. The next prime is 189855145813. The reversal of 189855145779 is 977541558981.

It is not a de Polignac number, because 189855145779 - 2²⁴ = 189838368563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189855145769) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7311982 + ... + 7337900.

It is an arithmetic number, because the mean of its divisors is an integer number (8661945600).

Almost surely, 2^189855145779 is an apocalyptic number.

189855145779 is a deficient number, since it is larger than the sum of its proper divisors (87327113421).

189855145779 is a wasteful number, since it uses less digits than its factorization.

189855145779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29075.

The product of its digits is 127008000, while the sum is 69.

The spelling of 189855145779 in words is "one hundred eighty-nine billion, eight hundred fifty-five million, one hundred forty-five thousand, seven hundred seventy-nine".