655909557 has 8 divisors (see below), whose sum is σ = 880930176. Its totient is φ = 434080992.

The previous prime is 655909547. The next prime is 655909603. The reversal of 655909557 is 755909556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 655909557 - 2⁶ = 655909493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655909547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 797533 + ... + 798354.

It is an arithmetic number, because the mean of its divisors is an integer number (110116272).

Almost surely, 2^655909557 is an apocalyptic number.

It is an amenable number.

655909557 is a deficient number, since it is larger than the sum of its proper divisors (225020619).

655909557 is a wasteful number, since it uses less digits than its factorization.

655909557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596027.

The product of its (nonzero) digits is 2126250, while the sum is 51.

The square root of 655909557 is about 25610.7312859278. The cubic root of 655909557 is about 868.8563636173.

Subtracting 655909557 from its reverse (755909556), we obtain a palindrome (99999999).

The spelling of 655909557 in words is "six hundred fifty-five million, nine hundred nine thousand, five hundred fifty-seven".