55421012477 has 2 divisors, whose sum is σ = 55421012478. Its totient is φ = 55421012476.

The previous prime is 55421012447. The next prime is 55421012501. The reversal of 55421012477 is 77421012455.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44408818756 + 11012193721 = 210734^2 + 104939^2 .

It is a cyclic number.

It is not a de Polignac number, because 55421012477 - 2²⁴ = 55404235261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55421012477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55421012447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710506238 + 27710506239.

It is an arithmetic number, because the mean of its divisors is an integer number (27710506239).

Almost surely, 2^55421012477 is an apocalyptic number.

It is an amenable number.

55421012477 is a deficient number, since it is larger than the sum of its proper divisors (1).

55421012477 is an equidigital number, since it uses as much as digits as its factorization.

55421012477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78400, while the sum is 38.

The spelling of 55421012477 in words is "fifty-five billion, four hundred twenty-one million, twelve thousand, four hundred seventy-seven".