1263589721968 has 30 divisors (see below), whose sum is σ = 2797975012136. Its totient is φ = 541533353856.

The previous prime is 1263589721939. The next prime is 1263589721981. The reversal of 1263589721968 is 8691279853621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11843196 + ... + 11949412.

Almost surely, 2^{1263589721968} is an apocalyptic number.

It is an amenable number.

1263589721968 is an abundant number, since it is smaller than the sum of its proper divisors (1534385290168).

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

1263589721968 is an frugal number, since it uses more digits than its factorization.

1263589721968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212449 (or 106226 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 67.

The spelling of 1263589721968 in words is "one trillion, two hundred sixty-three billion, five hundred eighty-nine million, seven hundred twenty-one thousand, nine hundred sixty-eight".