655391869 has 16 divisors (see below), whose sum is σ = 729596160. Its totient is φ = 583704000.

The previous prime is 655391843. The next prime is 655391881. The reversal of 655391869 is 968193556.

It is not a de Polignac number, because 655391869 - 2⁷ = 655391741 is a prime.

It is a super-2 number, since 2×655391869² = 859077003902626322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655391819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178684 + ... + 182314.

It is an arithmetic number, because the mean of its divisors is an integer number (45599760).

Almost surely, 2^655391869 is an apocalyptic number.

It is an amenable number.

655391869 is a deficient number, since it is larger than the sum of its proper divisors (74204291).

655391869 is a wasteful number, since it uses less digits than its factorization.

655391869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972.

The product of its digits is 1749600, while the sum is 52.

The square root of 655391869 is about 25600.6224338394. The cubic root of 655391869 is about 868.6277167981.

The spelling of 655391869 in words is "six hundred fifty-five million, three hundred ninety-one thousand, eight hundred sixty-nine".