697859977 has 2 divisors, whose sum is σ = 697859978. Its totient is φ = 697859976.

The previous prime is 697859969. The next prime is 697859989. The reversal of 697859977 is 779958796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671017216 + 26842761 = 25904^2 + 5181^2 .

It is a cyclic number.

It is not a de Polignac number, because 697859977 - 2³ = 697859969 is a prime.

It is not a weakly prime, because it can be changed into another prime (697859927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348929988 + 348929989.

It is an arithmetic number, because the mean of its divisors is an integer number (348929989).

Almost surely, 2^697859977 is an apocalyptic number.

It is an amenable number.

697859977 is a deficient number, since it is larger than the sum of its proper divisors (1).

697859977 is an equidigital number, since it uses as much as digits as its factorization.

697859977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60011280, while the sum is 67.

The square root of 697859977 is about 26417.0395199765. The cubic root of 697859977 is about 886.9982519189.

The spelling of 697859977 in words is "six hundred ninety-seven million, eight hundred fifty-nine thousand, nine hundred seventy-seven".