55780830557 has 2 divisors, whose sum is σ = 55780830558. Its totient is φ = 55780830556.

The previous prime is 55780830541. The next prime is 55780830563. The reversal of 55780830557 is 75503808755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43834121956 + 11946708601 = 209366^2 + 109301^2 .

It is a cyclic number.

It is not a de Polignac number, because 55780830557 - 2⁴ = 55780830541 is a prime.

It is a super-2 number, since 2×55780830557² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55780830499 and 55780830508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55780830587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27890415278 + 27890415279.

It is an arithmetic number, because the mean of its divisors is an integer number (27890415279).

Almost surely, 2^55780830557 is an apocalyptic number.

It is an amenable number.

55780830557 is a deficient number, since it is larger than the sum of its proper divisors (1).

55780830557 is an equidigital number, since it uses as much as digits as its factorization.

55780830557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880000, while the sum is 53.

The spelling of 55780830557 in words is "fifty-five billion, seven hundred eighty million, eight hundred thirty thousand, five hundred fifty-seven".