2129257887768 has 96 divisors (see below), whose sum is σ = 6309657628560. Its totient is φ = 643314954240.

The previous prime is 2129257887739. The next prime is 2129257887821. The reversal of 2129257887768 is 8677887529212.

2129257887768 is a `hidden beast` number, since 21 + 29 + 2 + 578 + 8 + 7 + 7 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 2129257887696 and 2129257887705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3721905 + ... + 4255712.

Almost surely, 2^{2129257887768} is an apocalyptic number.

It is an amenable number.

2129257887768 is an abundant number, since it is smaller than the sum of its proper divisors (4180399740792).

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

2129257887768 is a wasteful number, since it uses less digits than its factorization.

2129257887768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7977977 (or 7977970 counting only the distinct ones).

The product of its digits is 379330560, while the sum is 72.

The spelling of 2129257887768 in words is "two trillion, one hundred twenty-nine billion, two hundred fifty-seven million, eight hundred eighty-seven thousand, seven hundred sixty-eight".