97978819973 has 2 divisors, whose sum is σ = 97978819974. Its totient is φ = 97978819972.

The previous prime is 97978819957. The next prime is 97978820039. The reversal of 97978819973 is 37991887979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50167936324 + 47810883649 = 223982^2 + 218657^2 .

It is a cyclic number.

It is not a de Polignac number, because 97978819973 - 2⁴ = 97978819957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 97978819894 and 97978819903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97978819903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48989409986 + 48989409987.

It is an arithmetic number, because the mean of its divisors is an integer number (48989409987).

Almost surely, 2^97978819973 is an apocalyptic number.

It is an amenable number.

97978819973 is a deficient number, since it is larger than the sum of its proper divisors (1).

97978819973 is an equidigital number, since it uses as much as digits as its factorization.

97978819973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432081216, while the sum is 77.

The spelling of 97978819973 in words is "ninety-seven billion, nine hundred seventy-eight million, eight hundred nineteen thousand, nine hundred seventy-three".