55845678981 has 4 divisors (see below), whose sum is σ = 74460905312. Its totient is φ = 37230452652.

The previous prime is 55845678979. The next prime is 55845679007. The reversal of 55845678981 is 18987654855.

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.

It is not a de Polignac number, because 55845678981 - 2¹ = 55845678979 is a prime.

It is a super-2 number, since 2×55845678981² (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 (55845678281) 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, 9307613161 + ... + 9307613166.

It is an arithmetic number, because the mean of its divisors is an integer number (18615226328).

Almost surely, 2^55845678981 is an apocalyptic number.

It is an amenable number.

55845678981 is a deficient number, since it is larger than the sum of its proper divisors (18615226331).

55845678981 is a wasteful number, since it uses less digits than its factorization.

55845678981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18615226330.

The product of its digits is 96768000, while the sum is 66.

The spelling of 55845678981 in words is "fifty-five billion, eight hundred forty-five million, six hundred seventy-eight thousand, nine hundred eighty-one".