6661643760 has 60 divisors (see below), whose sum is σ = 22372022712. Its totient is φ = 1776438144.

The previous prime is 6661643753. The next prime is 6661643767. The reversal of 6661643760 is 673461666.

It is an interprime number because it is at equal distance from previous prime (6661643753) and next prime (6661643767).

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661643767) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4625422 + ... + 4626861.

Almost surely, 2^6661643760 is an apocalyptic number.

6661643760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6661643760 is an abundant number, since it is smaller than the sum of its proper divisors (15710378952).

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

6661643760 is a wasteful number, since it uses less digits than its factorization.

6661643760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9252302 (or 9252293 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The square root of 6661643760 is about 81618.8934009767. The cubic root of 6661643760 is about 1881.5992653883.

The spelling of 6661643760 in words is "six billion, six hundred sixty-one million, six hundred forty-three thousand, seven hundred sixty".