55805557 has 2 divisors, whose sum is σ = 55805558. Its totient is φ = 55805556.

The previous prime is 55805537. The next prime is 55805593. The reversal of 55805557 is 75550855.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48358116 + 7447441 = 6954^2 + 2729^2 .

It is a cyclic number.

It is not a de Polignac number, because 55805557 - 2¹⁵ = 55772789 is a prime.

It is a super-2 number, since 2×55805557² = 6228520384160498, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55805537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27902778 + 27902779.

It is an arithmetic number, because the mean of its divisors is an integer number (27902779).

Almost surely, 2^55805557 is an apocalyptic number.

It is an amenable number.

55805557 is a deficient number, since it is larger than the sum of its proper divisors (1).

55805557 is an equidigital number, since it uses as much as digits as its factorization.

55805557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 175000, while the sum is 40.

The square root of 55805557 is about 7470.3117070173. The cubic root of 55805557 is about 382.1429182070.

The spelling of 55805557 in words is "fifty-five million, eight hundred five thousand, five hundred fifty-seven".