659691031691 has 16 divisors (see below), whose sum is σ = 699436803840. Its totient is φ = 621102349440.

The previous prime is 659691031679. The next prime is 659691031721. The reversal of 659691031691 is 196130196956.

It is a cyclic number.

It is not a de Polignac number, because 659691031691 - 2¹⁰ = 659691030667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (659691036691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20580665 + ... + 20612693.

It is an arithmetic number, because the mean of its divisors is an integer number (43714800240).

Almost surely, 2^659691031691 is an apocalyptic number.

659691031691 is a deficient number, since it is larger than the sum of its proper divisors (39745772149).

659691031691 is a wasteful number, since it uses less digits than its factorization.

659691031691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50054.

The product of its (nonzero) digits is 2361960, while the sum is 56.

The spelling of 659691031691 in words is "six hundred fifty-nine billion, six hundred ninety-one million, thirty-one thousand, six hundred ninety-one".