255645571645 has 8 divisors (see below), whose sum is σ = 314256995640. Its totient is φ = 199528250880.

The previous prime is 255645571553. The next prime is 255645571661. The reversal of 255645571645 is 546175546552.

It can be written as a sum of positive squares in 4 ways, for example, as 17811838521 + 237833733124 = 133461^2 + 487682^2 .

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

It is not a de Polignac number, because 255645571645 - 2¹⁵ = 255645538877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623525580 + ... + 623525989.

It is an arithmetic number, because the mean of its divisors is an integer number (39282124455).

Almost surely, 2^255645571645 is an apocalyptic number.

It is an amenable number.

255645571645 is a deficient number, since it is larger than the sum of its proper divisors (58611423995).

255645571645 is a wasteful number, since it uses less digits than its factorization.

255645571645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247051615.

The product of its digits is 25200000, while the sum is 55.

The spelling of 255645571645 in words is "two hundred fifty-five billion, six hundred forty-five million, five hundred seventy-one thousand, six hundred forty-five".