655115621 has 8 divisors (see below), whose sum is σ = 709784064. Its totient is φ = 602239680.

The previous prime is 655115603. The next prime is 655115633. The reversal of 655115621 is 126511556.

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

It is a cyclic number.

It is not a de Polignac number, because 655115621 - 2⁶ = 655115557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655115521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447365 + ... + 448826.

It is an arithmetic number, because the mean of its divisors is an integer number (88723008).

Almost surely, 2^655115621 is an apocalyptic number.

It is an amenable number.

655115621 is a deficient number, since it is larger than the sum of its proper divisors (54668443).

655115621 is a wasteful number, since it uses less digits than its factorization.

655115621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896251.

The product of its digits is 9000, while the sum is 32.

The square root of 655115621 is about 25595.2265276164. The cubic root of 655115621 is about 868.5056573084.

The spelling of 655115621 in words is "six hundred fifty-five million, one hundred fifteen thousand, six hundred twenty-one".