2663609978 has 32 divisors (see below), whose sum is σ = 4111430400. Its totient is φ = 1293836544.

The previous prime is 2663609969. The next prime is 2663610043. The reversal of 2663609978 is 8799063662.

It is a super-2 number, since 2×2663609978² = 14189636229802320968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4316726 + ... + 4317342.

It is an arithmetic number, because the mean of its divisors is an integer number (128482200).

Almost surely, 2^2663609978 is an apocalyptic number.

2663609978 is a deficient number, since it is larger than the sum of its proper divisors (1447820422).

2663609978 is a wasteful number, since it uses less digits than its factorization.

2663609978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094.

The product of its (nonzero) digits is 5878656, while the sum is 56.

The square root of 2663609978 is about 51610.1732025770. The cubic root of 2663609978 is about 1386.1924987376.

The spelling of 2663609978 in words is "two billion, six hundred sixty-three million, six hundred nine thousand, nine hundred seventy-eight".