1663642564 has 12 divisors (see below), whose sum is σ = 2911683600. Its totient is φ = 831732968.

The previous prime is 1663642549. The next prime is 1663642567. The reversal of 1663642564 is 4652463661.

It is a self number, because there is not a number n which added to its sum of digits gives 1663642564.

It is not an unprimeable number, because it can be changed into a prime (1663642567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39207 + ... + 69745.

It is an arithmetic number, because the mean of its divisors is an integer number (242640300).

Almost surely, 2^1663642564 is an apocalyptic number.

It is an amenable number.

1663642564 is a deficient number, since it is larger than the sum of its proper divisors (1248041036).

1663642564 is a wasteful number, since it uses less digits than its factorization.

1663642564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44162 (or 44160 counting only the distinct ones).

The product of its digits is 622080, while the sum is 43.

The square root of 1663642564 is about 40787.7746880116. The cubic root of 1663642564 is about 1184.9135733106.

The spelling of 1663642564 in words is "one billion, six hundred sixty-three million, six hundred forty-two thousand, five hundred sixty-four".