56426206981 has 4 divisors (see below), whose sum is σ = 58879520352. Its totient is φ = 53972893612.

The previous prime is 56426206979. The next prime is 56426206997. The reversal of 56426206981 is 18960262465.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18960262465 = 5 ⋅3792052493.

It is a cyclic number.

It is not a de Polignac number, because 56426206981 - 2¹ = 56426206979 is a prime.

It is a super-2 number, since 2×56426206981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56426206901) 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, 1226656651 + ... + 1226656696.

It is an arithmetic number, because the mean of its divisors is an integer number (14719880088).

Almost surely, 2^56426206981 is an apocalyptic number.

It is an amenable number.

56426206981 is a deficient number, since it is larger than the sum of its proper divisors (2453313371).

56426206981 is a wasteful number, since it uses less digits than its factorization.

56426206981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453313370.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 56426206981 in words is "fifty-six billion, four hundred twenty-six million, two hundred six thousand, nine hundred eighty-one".