56421541881 has 12 divisors (see below), whose sum is σ = 81510315952. Its totient is φ = 37608576696.

The previous prime is 56421541877. The next prime is 56421541889. The reversal of 56421541881 is 18814512465.

56421541881 is a `hidden beast` number, since 5 + 6 + 4 + 21 + 541 + 8 + 81 = 666.

It is not a de Polignac number, because 56421541881 - 2² = 56421541877 is a prime.

It is a super-4 number, since 4×56421541881⁴ (a number of 44 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56421541889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 419851 + ... + 537696.

Almost surely, 2^56421541881 is an apocalyptic number.

It is an amenable number.

56421541881 is a deficient number, since it is larger than the sum of its proper divisors (25088774071).

56421541881 is a wasteful number, since it uses less digits than its factorization.

56421541881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964100 (or 964097 counting only the distinct ones).

The product of its digits is 307200, while the sum is 45.

The spelling of 56421541881 in words is "fifty-six billion, four hundred twenty-one million, five hundred forty-one thousand, eight hundred eighty-one".