255775557780 has 72 divisors (see below), whose sum is σ = 802606077000. Its totient is φ = 65854854912.

The previous prime is 255775557773. The next prime is 255775557823. The reversal of 255775557780 is 87755577552.

255775557780 is a `hidden beast` number, since 2 + 5 + 5 + 7 + 7 + 5 + 557 + 78 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 36813329424 + 218962228356 = 191868^2 + 467934^2 .

It is a super-2 number, since 2×255775557780² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24494355 + ... + 24504794.

It is an arithmetic number, because the mean of its divisors is an integer number (11147306625).

Almost surely, 2^255775557780 is an apocalyptic number.

255775557780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255775557780 is an abundant number, since it is smaller than the sum of its proper divisors (546830519220).

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

255775557780 is a wasteful number, since it uses less digits than its factorization.

255775557780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48999193 (or 48999188 counting only the distinct ones).

The product of its (nonzero) digits is 120050000, while the sum is 63.

The spelling of 255775557780 in words is "two hundred fifty-five billion, seven hundred seventy-five million, five hundred fifty-seven thousand, seven hundred eighty".