55345520981 has 2 divisors, whose sum is σ = 55345520982. Its totient is φ = 55345520980.

The previous prime is 55345520953. The next prime is 55345520987. The reversal of 55345520981 is 18902554355.

55345520981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34963390225 + 20382130756 = 186985^2 + 142766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55345520981 is a prime.

It is a super-2 number, since 2×55345520981² (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 (55345520987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27672760490 + 27672760491.

It is an arithmetic number, because the mean of its divisors is an integer number (27672760491).

Almost surely, 2^55345520981 is an apocalyptic number.

It is an amenable number.

55345520981 is a deficient number, since it is larger than the sum of its proper divisors (1).

55345520981 is an equidigital number, since it uses as much as digits as its factorization.

55345520981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080000, while the sum is 47.

The spelling of 55345520981 in words is "fifty-five billion, three hundred forty-five million, five hundred twenty thousand, nine hundred eighty-one".