187172845542 has 12 divisors (see below), whose sum is σ = 405541165380. Its totient is φ = 62390948508.

The previous prime is 187172845529. The next prime is 187172845547. The reversal of 187172845542 is 245548271781.

187172845542 is a `hidden beast` number, since 1 + 8 + 7 + 1 + 7 + 2 + 84 + 554 + 2 = 666.

187172845542 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187172845547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5199245692 + ... + 5199245727.

It is an arithmetic number, because the mean of its divisors is an integer number (33795097115).

Almost surely, 2^187172845542 is an apocalyptic number.

187172845542 is an abundant number, since it is smaller than the sum of its proper divisors (218368319838).

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

187172845542 is a wasteful number, since it uses less digits than its factorization.

187172845542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10398491427 (or 10398491424 counting only the distinct ones).

The product of its digits is 5017600, while the sum is 54.

The spelling of 187172845542 in words is "one hundred eighty-seven billion, one hundred seventy-two million, eight hundred forty-five thousand, five hundred forty-two".