2668778664 has 32 divisors (see below), whose sum is σ = 6675613920. Its totient is φ = 889103936.

The previous prime is 2668778657. The next prime is 2668778687. The reversal of 2668778664 is 4668778662.

It is a junction number, because it is equal to n+sod(n) for n = 2668778598 and 2668778607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15427 + ... + 74669.

It is an arithmetic number, because the mean of its divisors is an integer number (208612935).

Almost surely, 2^2668778664 is an apocalyptic number.

2668778664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2668778664 is an abundant number, since it is smaller than the sum of its proper divisors (4006835256).

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

2668778664 is a wasteful number, since it uses less digits than its factorization.

2668778664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61129 (or 61125 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 60.

The square root of 2668778664 is about 51660.2232283214. The cubic root of 2668778664 is about 1387.0885463856.

The spelling of 2668778664 in words is "two billion, six hundred sixty-eight million, seven hundred seventy-eight thousand, six hundred sixty-four".