255731645351620 has 48 divisors (see below), whose sum is σ = 569095613151408. Its totient is φ = 96196073103360.

The previous prime is 255731645351579. The next prime is 255731645351647. The reversal of 255731645351620 is 26153546137552.

It can be written as a sum of positive squares in 8 ways, for example, as 74334331653696 + 181397313697924 = 8621736^2 + 13468382^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309625461 + ... + 310450300.

It is an arithmetic number, because the mean of its divisors is an integer number (11856158607321).

Almost surely, 2^{255731645351620} is an apocalyptic number.

255731645351620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255731645351620 is an abundant number, since it is smaller than the sum of its proper divisors (313363967799788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255731645351620 is a wasteful number, since it uses less digits than its factorization.

255731645351620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620077000 (or 620076998 counting only the distinct ones).

The product of its (nonzero) digits is 22680000, while the sum is 55.

The spelling of 255731645351620 in words is "two hundred fifty-five trillion, seven hundred thirty-one billion, six hundred forty-five million, three hundred fifty-one thousand, six hundred twenty".