697215387959 has 4 divisors (see below), whose sum is σ = 698490005304. Its totient is φ = 695940770616.

The previous prime is 697215387829. The next prime is 697215387989. The reversal of 697215387959 is 959783512796.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697215387959 is a prime.

It is a super-2 number, since 2×697215387959² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 697215387892 and 697215387901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697215387989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637307852 + ... + 637308945.

It is an arithmetic number, because the mean of its divisors is an integer number (174622501326).

Almost surely, 2^697215387959 is an apocalyptic number.

697215387959 is a deficient number, since it is larger than the sum of its proper divisors (1274617345).

697215387959 is a wasteful number, since it uses less digits than its factorization.

697215387959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274617344.

The product of its digits is 257191200, while the sum is 71.

The spelling of 697215387959 in words is "six hundred ninety-seven billion, two hundred fifteen million, three hundred eighty-seven thousand, nine hundred fifty-nine".