12400642555 has 16 divisors (see below), whose sum is σ = 17018149824. Its totient is φ = 8497520640.

The previous prime is 12400642549. The next prime is 12400642589. The reversal of 12400642555 is 55524600421.

It is not a de Polignac number, because 12400642555 - 2⁷ = 12400642427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12400642555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67782 + ... + 171451.

It is an arithmetic number, because the mean of its divisors is an integer number (1063634364).

Almost surely, 2^12400642555 is an apocalyptic number.

12400642555 is a deficient number, since it is larger than the sum of its proper divisors (4617507269).

12400642555 is a wasteful number, since it uses less digits than its factorization.

12400642555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240726.

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 12400642555 in words is "twelve billion, four hundred million, six hundred forty-two thousand, five hundred fifty-five".