6661890513876 has 192 divisors, whose sum is σ = 17460613775360. Its totient is φ = 1963064263680.

The previous prime is 6661890513871. The next prime is 6661890513923. The reversal of 6661890513876 is 6783150981666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661890513871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 210384021 + ... + 210415683.

Almost surely, 2^{6661890513876} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6661890513876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8730306887680).

6661890513876 is an abundant number, since it is smaller than the sum of its proper divisors (10798723261484).

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

6661890513876 is a wasteful number, since it uses less digits than its factorization.

6661890513876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32166 (or 32164 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 66.

The spelling of 6661890513876 in words is "six trillion, six hundred sixty-one billion, eight hundred ninety million, five hundred thirteen thousand, eight hundred seventy-six".