55054999981 has 2 divisors, whose sum is σ = 55054999982. Its totient is φ = 55054999980.

The previous prime is 55054999949. The next prime is 55055000003. The reversal of 55054999981 is 18999945055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37401626025 + 17653373956 = 193395^2 + 132866^2 .

It is a cyclic number.

It is not a de Polignac number, because 55054999981 - 2⁵ = 55054999949 is a prime.

It is a super-2 number, since 2×55054999981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55054999381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27527499990 + 27527499991.

It is an arithmetic number, because the mean of its divisors is an integer number (27527499991).

Almost surely, 2^55054999981 is an apocalyptic number.

It is an amenable number.

55054999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

55054999981 is an equidigital number, since it uses as much as digits as its factorization.

55054999981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244000, while the sum is 64.

The spelling of 55054999981 in words is "fifty-five billion, fifty-four million, nine hundred ninety-nine thousand, nine hundred eighty-one".