89681688997 has 2 divisors, whose sum is σ = 89681688998. Its totient is φ = 89681688996.

The previous prime is 89681688961. The next prime is 89681689037. The reversal of 89681688997 is 79988618698.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89090907361 + 590781636 = 298481^2 + 24306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89681688997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89681688907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44840844498 + 44840844499.

It is an arithmetic number, because the mean of its divisors is an integer number (44840844499).

Almost surely, 2^89681688997 is an apocalyptic number.

It is an amenable number.

89681688997 is a deficient number, since it is larger than the sum of its proper divisors (1).

89681688997 is an equidigital number, since it uses as much as digits as its factorization.

89681688997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752467968, while the sum is 79.

The spelling of 89681688997 in words is "eighty-nine billion, six hundred eighty-one million, six hundred eighty-eight thousand, nine hundred ninety-seven".