55125439991 has 2 divisors, whose sum is σ = 55125439992. Its totient is φ = 55125439990.

The previous prime is 55125439981. The next prime is 55125440023. The reversal of 55125439991 is 19993452155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55125439991 - 2⁶ = 55125439927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55125439981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27562719995 + 27562719996.

It is an arithmetic number, because the mean of its divisors is an integer number (27562719996).

Almost surely, 2^55125439991 is an apocalyptic number.

55125439991 is a deficient number, since it is larger than the sum of its proper divisors (1).

55125439991 is an equidigital number, since it uses as much as digits as its factorization.

55125439991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187000, while the sum is 53.

The spelling of 55125439991 in words is "fifty-five billion, one hundred twenty-five million, four hundred thirty-nine thousand, nine hundred ninety-one".