2651378781968 has 20 divisors (see below), whose sum is σ = 5870910160320. Its totient is φ = 1136305192224.

The previous prime is 2651378781841. The next prime is 2651378781983. The reversal of 2651378781968 is 8691878731562.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11836512308 + ... + 11836512531.

It is an arithmetic number, because the mean of its divisors is an integer number (293545508016).

Almost surely, 2^{2651378781968} is an apocalyptic number.

2651378781968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2651378781968 is an abundant number, since it is smaller than the sum of its proper divisors (3219531378352).

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

2651378781968 is a wasteful number, since it uses less digits than its factorization.

2651378781968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23673024854 (or 23673024848 counting only the distinct ones).

The product of its digits is 243855360, while the sum is 71.

The spelling of 2651378781968 in words is "two trillion, six hundred fifty-one billion, three hundred seventy-eight million, seven hundred eighty-one thousand, nine hundred sixty-eight".