255212636661 has 24 divisors (see below), whose sum is σ = 370436451840. Its totient is φ = 169313544576.

The previous prime is 255212636621. The next prime is 255212636687. The reversal of 255212636661 is 166636212552.

It is not a de Polignac number, because 255212636661 - 2⁷ = 255212636533 is a prime.

It is a super-2 number, since 2×255212636661² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255212636621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4546381 + ... + 4602173.

It is an arithmetic number, because the mean of its divisors is an integer number (15434852160).

Almost surely, 2^255212636661 is an apocalyptic number.

It is an amenable number.

255212636661 is a deficient number, since it is larger than the sum of its proper divisors (115223815179).

255212636661 is a wasteful number, since it uses less digits than its factorization.

255212636661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58265 (or 58262 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The spelling of 255212636661 in words is "two hundred fifty-five billion, two hundred twelve million, six hundred thirty-six thousand, six hundred sixty-one".