1261715717056 has 28 divisors (see below), whose sum is σ = 2508164297352. Its totient is φ = 629737311488.

The previous prime is 1261715717021. The next prime is 1261715717071. The reversal of 1261715717056 is 6507175171621.

It is a super-2 number, since 2×1261715717056² (a number of 25 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 3 ways as a sum of consecutive naturals, for example, 17472235 + ... + 17544298.

It is an arithmetic number, because the mean of its divisors is an integer number (89577296334).

Almost surely, 2^{1261715717056} is an apocalyptic number.

1261715717056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1261715717056 is a deficient number, since it is larger than the sum of its proper divisors (1246448580296).

1261715717056 is an equidigital number, since it uses as much as digits as its factorization.

1261715717056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35017108 (or 35017098 counting only the distinct ones).

The product of its (nonzero) digits is 617400, while the sum is 49.

The spelling of 1261715717056 in words is "one trillion, two hundred sixty-one billion, seven hundred fifteen million, seven hundred seventeen thousand, fifty-six".