655478557 has 2 divisors, whose sum is σ = 655478558. Its totient is φ = 655478556.

The previous prime is 655478531. The next prime is 655478573. The reversal of 655478557 is 755874556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 491996761 + 163481796 = 22181^2 + 12786^2 .

It is a cyclic number.

It is not a de Polignac number, because 655478557 - 2²⁷ = 521260829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655478597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327739278 + 327739279.

It is an arithmetic number, because the mean of its divisors is an integer number (327739279).

Almost surely, 2^655478557 is an apocalyptic number.

It is an amenable number.

655478557 is a deficient number, since it is larger than the sum of its proper divisors (1).

655478557 is an equidigital number, since it uses as much as digits as its factorization.

655478557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5880000, while the sum is 52.

The square root of 655478557 is about 25602.3154616921. The cubic root of 655478557 is about 868.6660126042. Note that the first 3 decimals are identical.

The spelling of 655478557 in words is "six hundred fifty-five million, four hundred seventy-eight thousand, five hundred fifty-seven".