1261302130856 has 16 divisors (see below), whose sum is σ = 2364954818100. Its totient is φ = 630647512704.

The previous prime is 1261302130853. The next prime is 1261302130859. The reversal of 1261302130856 is 6580312031621.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1261302130853) and next prime (1261302130859).

It can be written as a sum of positive squares in 2 ways, for example, as 1250706722500 + 10595408356 = 1118350^2 + 102934^2 .

It is a super-2 number, since 2×1261302130856² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1261302130853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640186 + ... + 2283158.

Almost surely, 2^{1261302130856} is an apocalyptic number.

It is an amenable number.

1261302130856 is a deficient number, since it is larger than the sum of its proper divisors (1103652687244).

1261302130856 is a wasteful number, since it uses less digits than its factorization.

1261302130856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888188 (or 888184 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 1261302130856 in words is "one trillion, two hundred sixty-one billion, three hundred two million, one hundred thirty thousand, eight hundred fifty-six".