56623043981 has 8 divisors (see below), whose sum is σ = 68518641600. Its totient is φ = 45679094208.

The previous prime is 56623043969. The next prime is 56623043993. The reversal of 56623043981 is 18934032665.

It is an interprime number because it is at equal distance from previous prime (56623043969) and next prime (56623043993).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56623043981 is a prime.

It is a super-2 number, since 2×56623043981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56623043951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237911831 + ... + 237912068.

It is an arithmetic number, because the mean of its divisors is an integer number (8564830200).

Almost surely, 2^56623043981 is an apocalyptic number.

It is an amenable number.

56623043981 is a deficient number, since it is larger than the sum of its proper divisors (11895597619).

56623043981 is a wasteful number, since it uses less digits than its factorization.

56623043981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475823923.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 56623043981 in words is "fifty-six billion, six hundred twenty-three million, forty-three thousand, nine hundred eighty-one".