6661983516 has 48 divisors (see below), whose sum is σ = 15688514688. Its totient is φ = 2200161600.

The previous prime is 6661983487. The next prime is 6661983527. The reversal of 6661983516 is 6153891666.

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, 1083186 + ... + 1089318.

It is an arithmetic number, because the mean of its divisors is an integer number (326844056).

Almost surely, 2^6661983516 is an apocalyptic number.

It is an amenable number.

6661983516 is an abundant number, since it is smaller than the sum of its proper divisors (9026531172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6661983516 is a wasteful number, since it uses less digits than its factorization.

6661983516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6962 (or 6960 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 51.

The square root of 6661983516 is about 81620.9747307639. The cubic root of 6661983516 is about 1881.6312531776.

The spelling of 6661983516 in words is "six billion, six hundred sixty-one million, nine hundred eighty-three thousand, five hundred sixteen".