55981507751 has 32 divisors (see below), whose sum is σ = 64825306560. Its totient is φ = 47958994944.

The previous prime is 55981507711. The next prime is 55981507753. The reversal of 55981507751 is 15770518955.

It is a cyclic number.

It is not a de Polignac number, because 55981507751 - 2³⁴ = 38801638567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55981507693 and 55981507702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55981507753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1133591 + ... + 1181943.

It is an arithmetic number, because the mean of its divisors is an integer number (2025790830).

Almost surely, 2^55981507751 is an apocalyptic number.

55981507751 is a deficient number, since it is larger than the sum of its proper divisors (8843798809).

55981507751 is a wasteful number, since it uses less digits than its factorization.

55981507751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48515.

The product of its (nonzero) digits is 2205000, while the sum is 53.

The spelling of 55981507751 in words is "fifty-five billion, nine hundred eighty-one million, five hundred seven thousand, seven hundred fifty-one".