123865634025 has 192 divisors, whose sum is σ = 267367887360. Its totient is φ = 55041638400.

The previous prime is 123865634023. The next prime is 123865634047. The reversal of 123865634025 is 520436568321.

123865634025 is a `hidden beast` number, since 1 + 2 + 3 + 8 + 6 + 5 + 634 + 0 + 2 + 5 = 666.

It is not a de Polignac number, because 123865634025 - 2¹ = 123865634023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (123865634023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 61409817 + ... + 61411833.

It is an arithmetic number, because the mean of its divisors is an integer number (1392541080).

Almost surely, 2^123865634025 is an apocalyptic number.

123865634025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123865634025 is an abundant number, since it is smaller than the sum of its proper divisors (143502253335).

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

123865634025 is a wasteful number, since it uses less digits than its factorization.

123865634025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401 (or 2390 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 123865634025 in words is "one hundred twenty-three billion, eight hundred sixty-five million, six hundred thirty-four thousand, twenty-five".