691676659 has 4 divisors (see below), whose sum is σ = 704727216. Its totient is φ = 678626104.

The previous prime is 691676633. The next prime is 691676707. The reversal of 691676659 is 956676196.

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

It is a cyclic number.

It is not a de Polignac number, because 691676659 - 2¹¹ = 691674611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691676159) 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, 6525199 + ... + 6525304.

It is an arithmetic number, because the mean of its divisors is an integer number (176181804).

Almost surely, 2^691676659 is an apocalyptic number.

691676659 is a deficient number, since it is larger than the sum of its proper divisors (13050557).

691676659 is a wasteful number, since it uses less digits than its factorization.

691676659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13050556.

The product of its digits is 3674160, while the sum is 55.

The square root of 691676659 is about 26299.7463675983. The cubic root of 691676659 is about 884.3707568110.

The spelling of 691676659 in words is "six hundred ninety-one million, six hundred seventy-six thousand, six hundred fifty-nine".