697713017009509 has 2 divisors, whose sum is σ = 697713017009510. Its totient is φ = 697713017009508.

The previous prime is 697713017009443. The next prime is 697713017009551. The reversal of 697713017009509 is 905900710317796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648138786444900 + 49574230564609 = 25458570^2 + 7040897^2 .

It is a cyclic number.

It is not a de Polignac number, because 697713017009509 - 2¹⁵ = 697713016976741 is a prime.

It is a super-2 number, since 2×697713017009509² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697713017009009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348856508504754 + 348856508504755.

It is an arithmetic number, because the mean of its divisors is an integer number (348856508504755).

Almost surely, 2^{697713017009509} is an apocalyptic number.

It is an amenable number.

697713017009509 is a deficient number, since it is larger than the sum of its proper divisors (1).

697713017009509 is an equidigital number, since it uses as much as digits as its factorization.

697713017009509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22504230, while the sum is 64.

The spelling of 697713017009509 in words is "six hundred ninety-seven trillion, seven hundred thirteen billion, seventeen million, nine thousand, five hundred nine".