1663542644 has 48 divisors (see below), whose sum is σ = 3161995200. Its totient is φ = 763105536.

The previous prime is 1663542557. The next prime is 1663542653. The reversal of 1663542644 is 4462453661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 653927 + ... + 656465.

It is an arithmetic number, because the mean of its divisors is an integer number (65874900).

Almost surely, 2^1663542644 is an apocalyptic number.

It is an amenable number.

1663542644 is a deficient number, since it is larger than the sum of its proper divisors (1498452556).

1663542644 is a wasteful number, since it uses less digits than its factorization.

1663542644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2832 (or 2830 counting only the distinct ones).

The product of its digits is 414720, while the sum is 41.

The square root of 1663542644 is about 40786.5497927932. The cubic root of 1663542644 is about 1184.8898504795.

The spelling of 1663542644 in words is "one billion, six hundred sixty-three million, five hundred forty-two thousand, six hundred forty-four".