2198766681 has 8 divisors (see below), whose sum is σ = 3257432160. Its totient is φ = 1465844436.

The previous prime is 2198766649. The next prime is 2198766683. The reversal of 2198766681 is 1866678912.

It is not a de Polignac number, because 2198766681 - 2⁵ = 2198766649 is a prime.

It is a super-2 number, since 2×2198766681² = 9669149834951511522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2198766683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40717875 + ... + 40717928.

It is an arithmetic number, because the mean of its divisors is an integer number (407179020).

Almost surely, 2^2198766681 is an apocalyptic number.

It is an amenable number.

2198766681 is a deficient number, since it is larger than the sum of its proper divisors (1058665479).

2198766681 is an equidigital number, since it uses as much as digits as its factorization.

2198766681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81435812 (or 81435806 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 2198766681 is about 46891.0085304208. The cubic root of 2198766681 is about 1300.3483644305.

The spelling of 2198766681 in words is "two billion, one hundred ninety-eight million, seven hundred sixty-six thousand, six hundred eighty-one".