99766681 has 4 divisors (see below), whose sum is σ = 114019072. Its totient is φ = 85514292.

The previous prime is 99766679. The next prime is 99766687. The reversal of 99766681 is 18666799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99766681 - 2¹ = 99766679 is a prime.

It is a super-2 number, since 2×99766681² = 19906781275511522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99766687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7126185 + ... + 7126198.

It is an arithmetic number, because the mean of its divisors is an integer number (28504768).

Almost surely, 2^99766681 is an apocalyptic number.

It is an amenable number.

99766681 is a deficient number, since it is larger than the sum of its proper divisors (14252391).

99766681 is a wasteful number, since it uses less digits than its factorization.

99766681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14252390.

The product of its digits is 979776, while the sum is 52.

The square root of 99766681 is about 9988.3272373306. The cubic root of 99766681 is about 463.7976119555.

The spelling of 99766681 in words is "ninety-nine million, seven hundred sixty-six thousand, six hundred eighty-one".