126561151566 has 64 divisors (see below), whose sum is σ = 282872486400. Its totient is φ = 41943495168.

The previous prime is 126561151529. The next prime is 126561151631. The reversal of 126561151566 is 665151165621.

126561151566 is a `hidden beast` number, since 1 + 2 + 6 + 561 + 15 + 15 + 66 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27709815 + ... + 27714381.

It is an arithmetic number, because the mean of its divisors is an integer number (4419882600).

Almost surely, 2^126561151566 is an apocalyptic number.

126561151566 is an abundant number, since it is smaller than the sum of its proper divisors (156311334834).

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

126561151566 is a wasteful number, since it uses less digits than its factorization.

126561151566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7430 (or 7424 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The spelling of 126561151566 in words is "one hundred twenty-six billion, five hundred sixty-one million, one hundred fifty-one thousand, five hundred sixty-six".