169679679661 has 4 divisors (see below), whose sum is σ = 170192307424. Its totient is φ = 169167051900.

The previous prime is 169679679647. The next prime is 169679679667. The reversal of 169679679661 is 166976976961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166976976961 = 25411 ⋅6571051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169679679661 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 (169679679667) 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, 256313385 + ... + 256314046.

It is an arithmetic number, because the mean of its divisors is an integer number (42548076856).

Almost surely, 2^169679679661 is an apocalyptic number.

It is an amenable number.

169679679661 is a deficient number, since it is larger than the sum of its proper divisors (512627763).

169679679661 is an equidigital number, since it uses as much as digits as its factorization.

169679679661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512627762.

The product of its digits is 277766496, while the sum is 73.

The spelling of 169679679661 in words is "one hundred sixty-nine billion, six hundred seventy-nine million, six hundred seventy-nine thousand, six hundred sixty-one".