55877945240921 has 2 divisors, whose sum is σ = 55877945240922. Its totient is φ = 55877945240920.

The previous prime is 55877945240911. The next prime is 55877945241029. The reversal of 55877945240921 is 12904254977855.

It is a happy number.

Together with next prime (55877945241029) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52506182593225 + 3371762647696 = 7246115^2 + 1836236^2 .

It is a cyclic number.

It is not a de Polignac number, because 55877945240921 - 2²⁶ = 55877878132057 is a prime.

It is not a weakly prime, because it can be changed into another prime (55877945240911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27938972620460 + 27938972620461.

It is an arithmetic number, because the mean of its divisors is an integer number (27938972620461).

Almost surely, 2^{55877945240921} is an apocalyptic number.

It is an amenable number.

55877945240921 is a deficient number, since it is larger than the sum of its proper divisors (1).

55877945240921 is an equidigital number, since it uses as much as digits as its factorization.

55877945240921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016000, while the sum is 68.

The spelling of 55877945240921 in words is "fifty-five trillion, eight hundred seventy-seven billion, nine hundred forty-five million, two hundred forty thousand, nine hundred twenty-one".