169421656 has 8 divisors (see below), whose sum is σ = 317665620. Its totient is φ = 84710824.

The previous prime is 169421653. The next prime is 169421663. The reversal of 169421656 is 656124961.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169421653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10588846 + ... + 10588861.

Almost surely, 2^169421656 is an apocalyptic number.

It is an amenable number.

169421656 is a deficient number, since it is larger than the sum of its proper divisors (148243964).

169421656 is a wasteful number, since it uses less digits than its factorization.

169421656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21177713 (or 21177709 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 169421656 is about 13016.2074353477. The cubic root of 169421656 is about 553.3369103493.

The spelling of 169421656 in words is "one hundred sixty-nine million, four hundred twenty-one thousand, six hundred fifty-six".