123015251664 has 40 divisors (see below), whose sum is σ = 353099334720. Its totient is φ = 41005083744.

The previous prime is 123015251659. The next prime is 123015251677. The reversal of 123015251664 is 466152510321.

123015251664 is a `hidden beast` number, since 1 + 2 + 30 + 1 + 52 + 516 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142378332 + ... + 142379195.

It is an arithmetic number, because the mean of its divisors is an integer number (8827483368).

Almost surely, 2^123015251664 is an apocalyptic number.

It is an amenable number.

123015251664 is an abundant number, since it is smaller than the sum of its proper divisors (230084083056).

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

123015251664 is a wasteful number, since it uses less digits than its factorization.

123015251664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284757544 (or 284757532 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 123015251664 its reverse (466152510321), we get a palindrome (589167761985).

The spelling of 123015251664 in words is "one hundred twenty-three billion, fifteen million, two hundred fifty-one thousand, six hundred sixty-four".