689197703661 has 12 divisors (see below), whose sum is σ = 997233118492. Its totient is φ = 458668832256.

The previous prime is 689197703657. The next prime is 689197703693. The reversal of 689197703661 is 166307791986.

689197703661 is a `hidden beast` number, since 6 + 89 + 197 + 7 + 0 + 366 + 1 = 666.

689197703661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 671596640100 + 17601063561 = 819510^2 + 132669^2 .

It is not a de Polignac number, because 689197703661 - 2² = 689197703657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689197703651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66353146 + ... + 66363531.

Almost surely, 2^689197703661 is an apocalyptic number.

It is an amenable number.

689197703661 is a deficient number, since it is larger than the sum of its proper divisors (308035414831).

689197703661 is a wasteful number, since it uses less digits than its factorization.

689197703661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132717260 (or 132717257 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 63.

The spelling of 689197703661 in words is "six hundred eighty-nine billion, one hundred ninety-seven million, seven hundred three thousand, six hundred sixty-one".