97985790997 has 2 divisors, whose sum is σ = 97985790998. Its totient is φ = 97985790996.

The previous prime is 97985790989. The next prime is 97985791069. The reversal of 97985790997 is 79909758979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97818192081 + 167598916 = 312759^2 + 12946^2 .

It is a cyclic number.

It is not a de Polignac number, because 97985790997 - 2³ = 97985790989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97985799997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48992895498 + 48992895499.

It is an arithmetic number, because the mean of its divisors is an integer number (48992895499).

Almost surely, 2^97985790997 is an apocalyptic number.

It is an amenable number.

97985790997 is a deficient number, since it is larger than the sum of its proper divisors (1).

97985790997 is an equidigital number, since it uses as much as digits as its factorization.

97985790997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810152280, while the sum is 79.

The spelling of 97985790997 in words is "ninety-seven billion, nine hundred eighty-five million, seven hundred ninety thousand, nine hundred ninety-seven".