1255560777765 has 192 divisors, whose sum is σ = 2563308633600. Its totient is φ = 556617664512.

The previous prime is 1255560777733. The next prime is 1255560777773. The reversal of 1255560777765 is 5677770655521.

1255560777765 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 560 + 7 + 7 + 7 + 7 + 65 = 666.

It is not a de Polignac number, because 1255560777765 - 2⁵ = 1255560777733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1854594607 + ... + 1854595283.

It is an arithmetic number, because the mean of its divisors is an integer number (13350565800).

Almost surely, 2^{1255560777765} is an apocalyptic number.

1255560777765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1255560777765 is an abundant number, since it is smaller than the sum of its proper divisors (1307747855835).

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

1255560777765 is a wasteful number, since it uses less digits than its factorization.

1255560777765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516 (or 1513 counting only the distinct ones).

The product of its (nonzero) digits is 108045000, while the sum is 63.

The spelling of 1255560777765 in words is "one trillion, two hundred fifty-five billion, five hundred sixty million, seven hundred seventy-seven thousand, seven hundred sixty-five".