99681806737 has 2 divisors, whose sum is σ = 99681806738. Its totient is φ = 99681806736.

The previous prime is 99681806717. The next prime is 99681806767. The reversal of 99681806737 is 73760818699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91445155201 + 8236651536 = 302399^2 + 90756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99681806737 is a prime.

It is not a weakly prime, because it can be changed into another prime (99681806717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49840903368 + 49840903369.

It is an arithmetic number, because the mean of its divisors is an integer number (49840903369).

Almost surely, 2^99681806737 is an apocalyptic number.

It is an amenable number.

99681806737 is a deficient number, since it is larger than the sum of its proper divisors (1).

99681806737 is an equidigital number, since it uses as much as digits as its factorization.

99681806737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 64.

The spelling of 99681806737 in words is "ninety-nine billion, six hundred eighty-one million, eight hundred six thousand, seven hundred thirty-seven".