1255715681 has 16 divisors (see below), whose sum is σ = 1446681600. Its totient is φ = 1077944400.

The previous prime is 1255715677. The next prime is 1255715687. The reversal of 1255715681 is 1865175521.

It is a cyclic number.

It is not a de Polignac number, because 1255715681 - 2² = 1255715677 is a prime.

It is a super-2 number, since 2×1255715681² = 3153643743018587522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255715687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55340 + ... + 74658.

It is an arithmetic number, because the mean of its divisors is an integer number (90417600).

Almost surely, 2^1255715681 is an apocalyptic number.

1255715681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1255715681 is a deficient number, since it is larger than the sum of its proper divisors (190965919).

1255715681 is a wasteful number, since it uses less digits than its factorization.

1255715681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19660.

The product of its digits is 84000, while the sum is 41.

The square root of 1255715681 is about 35436.0788039535. The cubic root of 1255715681 is about 1078.8567236948.

The spelling of 1255715681 in words is "one billion, two hundred fifty-five million, seven hundred fifteen thousand, six hundred eighty-one".