691704142345 has 4 divisors (see below), whose sum is σ = 830044970820. Its totient is φ = 553363313872.

The previous prime is 691704142331. The next prime is 691704142369. The reversal of 691704142345 is 543241407196.

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

It can be written as a sum of positive squares in 2 ways, for example, as 290802426121 + 400901716224 = 539261^2 + 633168^2 .

It is a cyclic number.

It is not a de Polignac number, because 691704142345 - 2¹³ = 691704134153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691704142295 and 691704142304.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69170414230 + ... + 69170414239.

It is an arithmetic number, because the mean of its divisors is an integer number (207511242705).

Almost surely, 2^691704142345 is an apocalyptic number.

It is an amenable number.

691704142345 is a deficient number, since it is larger than the sum of its proper divisors (138340828475).

691704142345 is a wasteful number, since it uses less digits than its factorization.

691704142345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138340828474.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 691704142345 in words is "six hundred ninety-one billion, seven hundred four million, one hundred forty-two thousand, three hundred forty-five".