655215697 has 18 divisors (see below), whose sum is σ = 698181302. Its totient is φ = 614777856.

The previous prime is 655215667. The next prime is 655215731. The reversal of 655215697 is 796512556.

It can be written as a sum of positive squares in 3 ways, for example, as 51825601 + 603390096 = 7199^2 + 24564^2 .

It is not a de Polignac number, because 655215697 - 2⁷ = 655215569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655215607) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5798313 + ... + 5798425.

Almost surely, 2^655215697 is an apocalyptic number.

It is an amenable number.

655215697 is a deficient number, since it is larger than the sum of its proper divisors (42965605).

655215697 is an equidigital number, since it uses as much as digits as its factorization.

655215697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 233 counting only the distinct ones).

The product of its digits is 567000, while the sum is 46.

The square root of 655215697 is about 25597.1814268681. The cubic root of 655215697 is about 868.5498796024.

The spelling of 655215697 in words is "six hundred fifty-five million, two hundred fifteen thousand, six hundred ninety-seven".