56661428133 has 24 divisors (see below), whose sum is σ = 84045836160. Its totient is φ = 36764441280.

The previous prime is 56661428107. The next prime is 56661428137. The reversal of 56661428133 is 33182416665.

It is not a de Polignac number, because 56661428133 - 2⁸ = 56661427877 is a prime.

It is a super-2 number, since 2×56661428133² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56661428137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151773 + ... + 369266.

It is an arithmetic number, because the mean of its divisors is an integer number (3501909840).

Almost surely, 2^56661428133 is an apocalyptic number.

It is an amenable number.

56661428133 is a deficient number, since it is larger than the sum of its proper divisors (27384408027).

56661428133 is a wasteful number, since it uses less digits than its factorization.

56661428133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521369 (or 521366 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 56661428133 in words is "fifty-six billion, six hundred sixty-one million, four hundred twenty-eight thousand, one hundred thirty-three".