1278644579696 has 30 divisors (see below), whose sum is σ = 2723063848176. Its totient is φ = 581202080800.

The previous prime is 1278644579627. The next prime is 1278644579699. The reversal of 1278644579696 is 6969754468721.

It is a super-2 number, since 2×1278644579696² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278644579699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 330226520 + ... + 330230391.

Almost surely, 2^{1278644579696} is an apocalyptic number.

1278644579696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1278644579696 is an abundant number, since it is smaller than the sum of its proper divisors (1444419268480).

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

1278644579696 is a wasteful number, since it uses less digits than its factorization.

1278644579696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660456941 (or 660456924 counting only the distinct ones).

The product of its digits is 1097349120, while the sum is 74.

The spelling of 1278644579696 in words is "one trillion, two hundred seventy-eight billion, six hundred forty-four million, five hundred seventy-nine thousand, six hundred ninety-six".