1261637912682 has 96 divisors (see below), whose sum is σ = 3228360220800. Its totient is φ = 348598857600.

The previous prime is 1261637912681. The next prime is 1261637912729. The reversal of 1261637912682 is 2862197361621.

It is a happy number.

1261637912682 is a `hidden beast` number, since 1 + 2 + 6 + 1 + 6 + 379 + 1 + 268 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (1261637912681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 605557 + ... + 1699992.

It is an arithmetic number, because the mean of its divisors is an integer number (33628752300).

Almost surely, 2^{1261637912682} is an apocalyptic number.

1261637912682 is an abundant number, since it is smaller than the sum of its proper divisors (1966722308118).

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

1261637912682 is a wasteful number, since it uses less digits than its factorization.

1261637912682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305708 (or 2305705 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 1261637912682 in words is "one trillion, two hundred sixty-one billion, six hundred thirty-seven million, nine hundred twelve thousand, six hundred eighty-two".