6666562740 has 96 divisors (see below), whose sum is σ = 18913112064. Its totient is φ = 1754403840.

The previous prime is 6666562729. The next prime is 6666562757. The reversal of 6666562740 is 472656666.

It is a self number, because there is not a number n which added to its sum of digits gives 6666562740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1498920 + ... + 1503360.

It is an arithmetic number, because the mean of its divisors is an integer number (197011584).

Almost surely, 2^6666562740 is an apocalyptic number.

6666562740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6666562740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9456556032).

6666562740 is an abundant number, since it is smaller than the sum of its proper divisors (12246549324).

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

6666562740 is a wasteful number, since it uses less digits than its factorization.

6666562740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4777 (or 4775 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 48.

The square root of 6666562740 is about 81649.0216720323. The cubic root of 6666562740 is about 1882.0622778375.

The spelling of 6666562740 in words is "six billion, six hundred sixty-six million, five hundred sixty-two thousand, seven hundred forty".