655390777689291 has 48 divisors (see below), whose sum is σ = 1041359828130720. Its totient is φ = 365359885793280.

The previous prime is 655390777689269. The next prime is 655390777689313. The reversal of 655390777689291 is 192986777093556.

It is an interprime number because it is at equal distance from previous prime (655390777689269) and next prime (655390777689313).

It is not a de Polignac number, because 655390777689291 - 2¹⁸ = 655390777427147 is a prime.

It is a super-2 number, since 2×655390777689291² (a number of 30 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (84) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (655390777689491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 147821455 + ... + 152190551.

It is an arithmetic number, because the mean of its divisors is an integer number (21694996419390).

Almost surely, 2^{655390777689291} is an apocalyptic number.

655390777689291 is a deficient number, since it is larger than the sum of its proper divisors (385969050441429).

655390777689291 is a wasteful number, since it uses less digits than its factorization.

655390777689291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4394044 (or 4394037 counting only the distinct ones).

The product of its (nonzero) digits is 10802030400, while the sum is 84.

The spelling of 655390777689291 in words is "six hundred fifty-five trillion, three hundred ninety billion, seven hundred seventy-seven million, six hundred eighty-nine thousand, two hundred ninety-one".