126556639504 has 15 divisors (see below), whose sum is σ = 245206246117. Its totient is φ = 63277608256.

The previous prime is 126556639499. The next prime is 126556639507. The reversal of 126556639504 is 405936655621.

The square root of 126556639504 is 355748.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 83810250000 + 42746389504 = 289500^2 + 206752^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126556639507) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1378524 + ... + 1467460.

Almost surely, 2^126556639504 is an apocalyptic number.

126556639504 is the 355748-th square number.

It is an amenable number.

126556639504 is a deficient number, since it is larger than the sum of its proper divisors (118649606613).

126556639504 is an frugal number, since it uses more digits than its factorization.

126556639504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177882 (or 88939 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 126556639504 in words is "one hundred twenty-six billion, five hundred fifty-six million, six hundred thirty-nine thousand, five hundred four".