55777555549 has 2 divisors, whose sum is σ = 55777555550. Its totient is φ = 55777555548.

The previous prime is 55777555511. The next prime is 55777555579. The reversal of 55777555549 is 94555577755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44719560900 + 11057994649 = 211470^2 + 105157^2 .

It is a cyclic number.

It is not a de Polignac number, because 55777555549 - 2²³ = 55769166941 is a prime.

It is a super-2 number, since 2×55777555549² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55777555579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27888777774 + 27888777775.

It is an arithmetic number, because the mean of its divisors is an integer number (27888777775).

Almost surely, 2^55777555549 is an apocalyptic number.

It is an amenable number.

55777555549 is a deficient number, since it is larger than the sum of its proper divisors (1).

55777555549 is an equidigital number, since it uses as much as digits as its factorization.

55777555549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192937500, while the sum is 64.

The spelling of 55777555549 in words is "fifty-five billion, seven hundred seventy-seven million, five hundred fifty-five thousand, five hundred forty-nine".