81696699 has 24 divisors (see below), whose sum is σ = 136113120. Its totient is φ = 46251648.

The previous prime is 81696697. The next prime is 81696701. The reversal of 81696699 is 99669618.

It is an interprime number because it is at equal distance from previous prime (81696697) and next prime (81696701).

It is not a de Polignac number, because 81696699 - 2¹ = 81696697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81696697) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 919 + ... + 12815.

It is an arithmetic number, because the mean of its divisors is an integer number (5671380).

Almost surely, 2^81696699 is an apocalyptic number.

81696699 is a deficient number, since it is larger than the sum of its proper divisors (54416421).

81696699 is a wasteful number, since it uses less digits than its factorization.

81696699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12019 (or 12016 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 81696699 is about 9038.6226273697. The cubic root of 81696699 is about 433.9118422594.

The spelling of 81696699 in words is "eighty-one million, six hundred ninety-six thousand, six hundred ninety-nine".