697872787979 has 2 divisors, whose sum is σ = 697872787980. Its totient is φ = 697872787978.

The previous prime is 697872787949. The next prime is 697872787999. The reversal of 697872787979 is 979787278796.

It is a happy number.

697872787979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 697872787979 - 2²⁰ = 697871739403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 697872787979.

It is not a weakly prime, because it can be changed into another prime (697872787949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348936393989 + 348936393990.

It is an arithmetic number, because the mean of its divisors is an integer number (348936393990).

Almost surely, 2^697872787979 is an apocalyptic number.

697872787979 is a deficient number, since it is larger than the sum of its proper divisors (1).

697872787979 is an equidigital number, since it uses as much as digits as its factorization.

697872787979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9409768704, while the sum is 86.

The spelling of 697872787979 in words is "six hundred ninety-seven billion, eight hundred seventy-two million, seven hundred eighty-seven thousand, nine hundred seventy-nine".