126639643034520 has 576 divisors, whose sum is σ = 518017677952320. Its totient is φ = 26264189952000.

The previous prime is 126639643034491. The next prime is 126639643034539. The reversal of 126639643034520 is 25430346936621.

126639643034520 is a `hidden beast` number, since 1 + 2 + 6 + 63 + 96 + 43 + 0 + 3 + 452 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 158464740 + ... + 159261900.

It is an arithmetic number, because the mean of its divisors is an integer number (899336246445).

Almost surely, 2^{126639643034520} is an apocalyptic number.

126639643034520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 126639643034520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259008838976160).

126639643034520 is an abundant number, since it is smaller than the sum of its proper divisors (391378034917800).

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

126639643034520 is a wasteful number, since it uses less digits than its factorization.

126639643034520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797728 (or 797710 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 54.

The spelling of 126639643034520 in words is "one hundred twenty-six trillion, six hundred thirty-nine billion, six hundred forty-three million, thirty-four thousand, five hundred twenty".