126257716920 has 32 divisors (see below), whose sum is σ = 378773151120. Its totient is φ = 33668724480.

The previous prime is 126257716909. The next prime is 126257716999. The reversal of 126257716920 is 29617752621.

It is a super-2 number, since 2×126257716920² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 126257716920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526073701 + ... + 526073940.

Almost surely, 2^126257716920 is an apocalyptic number.

126257716920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126257716920 is an abundant number, since it is smaller than the sum of its proper divisors (252515434200).

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

126257716920 is a wasteful number, since it uses less digits than its factorization.

126257716920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052147655 (or 1052147651 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 126257716920 in words is "one hundred twenty-six billion, two hundred fifty-seven million, seven hundred sixteen thousand, nine hundred twenty".