56100009981 has 8 divisors (see below), whose sum is σ = 75371006304. Its totient is φ = 37114510160.

The previous prime is 56100009949. The next prime is 56100010003. The reversal of 56100009981 is 18990000165.

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

It is a cyclic number.

It is not a de Polignac number, because 56100009981 - 2⁵ = 56100009949 is a prime.

It is a super-2 number, since 2×56100009981² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56100009181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71373666 + ... + 71374451.

It is an arithmetic number, because the mean of its divisors is an integer number (9421375788).

Almost surely, 2^56100009981 is an apocalyptic number.

It is an amenable number.

56100009981 is a deficient number, since it is larger than the sum of its proper divisors (19270996323).

56100009981 is a wasteful number, since it uses less digits than its factorization.

56100009981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142748251.

The product of its (nonzero) digits is 19440, while the sum is 39.

The spelling of 56100009981 in words is "fifty-six billion, one hundred million, nine thousand, nine hundred eighty-one".