655115557 has 2 divisors, whose sum is σ = 655115558. Its totient is φ = 655115556.

The previous prime is 655115537. The next prime is 655115603. The reversal of 655115557 is 755511556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376592836 + 278522721 = 19406^2 + 16689^2 .

It is a cyclic number.

It is not a de Polignac number, because 655115557 - 2¹⁹ = 654591269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655115537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327557778 + 327557779.

It is an arithmetic number, because the mean of its divisors is an integer number (327557779).

Almost surely, 2^655115557 is an apocalyptic number.

It is an amenable number.

655115557 is a deficient number, since it is larger than the sum of its proper divisors (1).

655115557 is an equidigital number, since it uses as much as digits as its factorization.

655115557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131250, while the sum is 40.

The square root of 655115557 is about 25595.2252773833. The cubic root of 655115557 is about 868.5056290262.

The spelling of 655115557 in words is "six hundred fifty-five million, one hundred fifteen thousand, five hundred fifty-seven".