1261313353612 has 96 divisors (see below), whose sum is σ = 2605255128000. Its totient is φ = 529232486400.

The previous prime is 1261313353579. The next prime is 1261313353613. The reversal of 1261313353612 is 2163533131621.

It is a super-2 number, since 2×1261313353612² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1261313353613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2215764 + ... + 2726212.

It is an arithmetic number, because the mean of its divisors is an integer number (27138074250).

Almost surely, 2^{1261313353612} is an apocalyptic number.

It is an amenable number.

1261313353612 is an abundant number, since it is smaller than the sum of its proper divisors (1343941774388).

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

1261313353612 is a wasteful number, since it uses less digits than its factorization.

1261313353612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510587 (or 510585 counting only the distinct ones).

The product of its digits is 58320, while the sum is 37.

It can be divided in two parts, 126131 and 3353612, that added together give a palindrome (3479743).

The spelling of 1261313353612 in words is "one trillion, two hundred sixty-one billion, three hundred thirteen million, three hundred fifty-three thousand, six hundred twelve".