697138344109 has 4 divisors (see below), whose sum is σ = 697164698560. Its totient is φ = 697111989660.

The previous prime is 697138344013. The next prime is 697138344137. The reversal of 697138344109 is 901443831796.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 697138344109 - 2³³ = 688548409517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 697138344109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697138384109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13137507 + ... + 13190464.

It is an arithmetic number, because the mean of its divisors is an integer number (174291174640).

Almost surely, 2^697138344109 is an apocalyptic number.

It is an amenable number.

697138344109 is a deficient number, since it is larger than the sum of its proper divisors (26354451).

697138344109 is a wasteful number, since it uses less digits than its factorization.

697138344109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26354450.

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 697138344109 in words is "six hundred ninety-seven billion, one hundred thirty-eight million, three hundred forty-four thousand, one hundred nine".