423659688661 has 18 divisors (see below), whose sum is σ = 466914123830. Its totient is φ = 384123476880.

The previous prime is 423659688619. The next prime is 423659688677. The reversal of 423659688661 is 166886956324.

It can be written as a sum of positive squares in only one way, i.e., 399360802500 + 24298886161 = 631950^2 + 155881^2 .

It is not a de Polignac number, because 423659688661 - 2¹¹ = 423659686613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 423659688593 and 423659688602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423659688691) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 17737435 + ... + 17761303.

Almost surely, 2^423659688661 is an apocalyptic number.

It is an amenable number.

423659688661 is a deficient number, since it is larger than the sum of its proper divisors (43254435169).

423659688661 is an equidigital number, since it uses as much as digits as its factorization.

423659688661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24657 (or 24263 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 64.

The spelling of 423659688661 in words is "four hundred twenty-three billion, six hundred fifty-nine million, six hundred eighty-eight thousand, six hundred sixty-one".