126561656 has 16 divisors (see below), whose sum is σ = 255557400. Its totient is φ = 58413024.

The previous prime is 126561653. The next prime is 126561661. The reversal of 126561656 is 656165621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126561653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608366 + ... + 608573.

Almost surely, 2^126561656 is an apocalyptic number.

It is an amenable number.

126561656 is an abundant number, since it is smaller than the sum of its proper divisors (128995744).

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

126561656 is a wasteful number, since it uses less digits than its factorization.

126561656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216958 (or 1216954 counting only the distinct ones).

The product of its digits is 64800, while the sum is 38.

The square root of 126561656 is about 11249.9624888264. The cubic root of 126561656 is about 502.0735965070.

The spelling of 126561656 in words is "one hundred twenty-six million, five hundred sixty-one thousand, six hundred fifty-six".