2663642564 has 24 divisors (see below), whose sum is σ = 5086552800. Its totient is φ = 1210409280.

The previous prime is 2663642561. The next prime is 2663642593. The reversal of 2663642564 is 4652463662.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (2663642561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222032 + ... + 233720.

It is an arithmetic number, because the mean of its divisors is an integer number (211939700).

Almost surely, 2^2663642564 is an apocalyptic number.

It is an amenable number.

2663642564 is a deficient number, since it is larger than the sum of its proper divisors (2422910236).

2663642564 is a wasteful number, since it uses less digits than its factorization.

2663642564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16883 (or 16881 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 44.

The square root of 2663642564 is about 51610.4888951849. The cubic root of 2663642564 is about 1386.1981515027.

The spelling of 2663642564 in words is "two billion, six hundred sixty-three million, six hundred forty-two thousand, five hundred sixty-four".