1263667978456 has 128 divisors (see below), whose sum is σ = 2665152000000. Its totient is φ = 557769991680.

The previous prime is 1263667978429. The next prime is 1263667978471. The reversal of 1263667978456 is 6548797663621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95588215 + ... + 95601433.

It is an arithmetic number, because the mean of its divisors is an integer number (20821500000).

Almost surely, 2^{1263667978456} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1263667978456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1332576000000).

1263667978456 is an abundant number, since it is smaller than the sum of its proper divisors (1401484021544).

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

1263667978456 is a wasteful number, since it uses less digits than its factorization.

1263667978456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13617 (or 13613 counting only the distinct ones).

The product of its digits is 548674560, while the sum is 70.

The spelling of 1263667978456 in words is "one trillion, two hundred sixty-three billion, six hundred sixty-seven million, nine hundred seventy-eight thousand, four hundred fifty-six".