1276661431296 has 1056 divisors, whose sum is σ = 4193723289600. Its totient is φ = 372544634880.

The previous prime is 1276661431289. The next prime is 1276661431351. The reversal of 1276661431296 is 6921341666721.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14344510420 + ... + 14344510508.

Almost surely, 2^{1276661431296} is an apocalyptic number.

1276661431296 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1276661431296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2096861644800).

1276661431296 is an abundant number, since it is smaller than the sum of its proper divisors (2917061858304).

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

1276661431296 is a wasteful number, since it uses less digits than its factorization.

1276661431296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 244 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 1276661431296 in words is "one trillion, two hundred seventy-six billion, six hundred sixty-one million, four hundred thirty-one thousand, two hundred ninety-six".