1276776944640 has 396 divisors, whose sum is σ = 4669156586484. Its totient is φ = 322549972992.

The previous prime is 1276776944627. The next prime is 1276776944671. The reversal of 1276776944640 is 464496776721.

1276776944640 is a `hidden beast` number, since 1 + 27 + 6 + 77 + 69 + 446 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 180618200064 + 1096158744576 = 424992^2 + 1046976^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16596504 + ... + 16673256.

Almost surely, 2^{1276776944640} is an apocalyptic number.

1276776944640 is a gapful number since it is divisible by the number (10) 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 1276776944640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2334578293242).

1276776944640 is an abundant number, since it is smaller than the sum of its proper divisors (3392379641844).

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

1276776944640 is a wasteful number, since it uses less digits than its factorization.

1276776944640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76822 (or 76782 counting only the distinct ones).

The product of its (nonzero) digits is 85349376, while the sum is 63.

The spelling of 1276776944640 in words is "one trillion, two hundred seventy-six billion, seven hundred seventy-six million, nine hundred forty-four thousand, six hundred forty".