55977619991 has 2 divisors, whose sum is σ = 55977619992. Its totient is φ = 55977619990.

The previous prime is 55977619927. The next prime is 55977620003. The reversal of 55977619991 is 19991677955.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55977619991 - 2⁶ = 55977619927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55977619391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27988809995 + 27988809996.

It is an arithmetic number, because the mean of its divisors is an integer number (27988809996).

Almost surely, 2^55977619991 is an apocalyptic number.

55977619991 is a deficient number, since it is larger than the sum of its proper divisors (1).

55977619991 is an equidigital number, since it uses as much as digits as its factorization.

55977619991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48223350, while the sum is 68.

The spelling of 55977619991 in words is "fifty-five billion, nine hundred seventy-seven million, six hundred nineteen thousand, nine hundred ninety-one".