55550557 has 2 divisors, whose sum is σ = 55550558. Its totient is φ = 55550556.

The previous prime is 55550527. The next prime is 55550587. The reversal of 55550557 is 75505555.

It is a balanced prime because it is at equal distance from previous prime (55550527) and next prime (55550587).

It can be written as a sum of positive squares in only one way, i.e., 52142841 + 3407716 = 7221^2 + 1846^2 .

It is a cyclic number.

It is not a de Polignac number, because 55550557 - 2¹⁹ = 55026269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55550527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27775278 + 27775279.

It is an arithmetic number, because the mean of its divisors is an integer number (27775279).

Almost surely, 2^55550557 is an apocalyptic number.

It is an amenable number.

55550557 is a deficient number, since it is larger than the sum of its proper divisors (1).

55550557 is an equidigital number, since it uses as much as digits as its factorization.

55550557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 109375, while the sum is 37.

The square root of 55550557 is about 7453.2246041562. The cubic root of 55550557 is about 381.5599700057.

The spelling of 55550557 in words is "fifty-five million, five hundred fifty thousand, five hundred fifty-seven".