2186888000661 has 96 divisors (see below), whose sum is σ = 3917915688960. Its totient is φ = 1144597392000.

The previous prime is 2186888000639. The next prime is 2186888000669. The reversal of 2186888000661 is 1660008886812.

It is not a de Polignac number, because 2186888000661 - 2¹³ = 2186887992469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2186888000598 and 2186888000607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2186888000669) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 267636106 + ... + 267644276.

It is an arithmetic number, because the mean of its divisors is an integer number (40811621760).

Almost surely, 2^{2186888000661} is an apocalyptic number.

2186888000661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2186888000661 is a deficient number, since it is larger than the sum of its proper divisors (1731027688299).

2186888000661 is a wasteful number, since it uses less digits than its factorization.

2186888000661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10687 (or 10684 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 54.

The spelling of 2186888000661 in words is "two trillion, one hundred eighty-six billion, eight hundred eighty-eight million, six hundred sixty-one", and thus it is an aban number.