2664737978 has 16 divisors (see below), whose sum is σ = 4571844864. Its totient is φ = 1141099920.

The previous prime is 2664737963. The next prime is 2664737987. The reversal of 2664737978 is 8797374662.

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, 59618 + ... + 94253.

It is an arithmetic number, because the mean of its divisors is an integer number (285740304).

Almost surely, 2^2664737978 is an apocalyptic number.

2664737978 is a deficient number, since it is larger than the sum of its proper divisors (1907106886).

2664737978 is a wasteful number, since it uses less digits than its factorization.

2664737978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155117.

The product of its digits is 21337344, while the sum is 59.

The square root of 2664737978 is about 51621.1001238835. The cubic root of 2664737978 is about 1386.3881485612.

The spelling of 2664737978 in words is "two billion, six hundred sixty-four million, seven hundred thirty-seven thousand, nine hundred seventy-eight".