55981980071 has 2 divisors, whose sum is σ = 55981980072. Its totient is φ = 55981980070.

The previous prime is 55981980031. The next prime is 55981980077. The reversal of 55981980071 is 17008918955.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55981980071 - 2²² = 55977785767 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55981979995 and 55981980022.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55981980077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27990990035 + 27990990036.

It is an arithmetic number, because the mean of its divisors is an integer number (27990990036).

Almost surely, 2^55981980071 is an apocalyptic number.

55981980071 is a deficient number, since it is larger than the sum of its proper divisors (1).

55981980071 is an equidigital number, since it uses as much as digits as its factorization.

55981980071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 53.

The spelling of 55981980071 in words is "fifty-five billion, nine hundred eighty-one million, nine hundred eighty thousand, seventy-one".