159669621 has 48 divisors (see below), whose sum is σ = 250810560. Its totient is φ = 97655040.

The previous prime is 159669617. The next prime is 159669647. The reversal of 159669621 is 126966951.

It is a happy number.

159669621 is a `hidden beast` number, since 15 + 9 + 6 + 6 + 9 + 621 = 666.

159669621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 159669621 - 2² = 159669617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159669121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 459970 + ... + 460316.

It is an arithmetic number, because the mean of its divisors is an integer number (5225220).

Almost surely, 2^159669621 is an apocalyptic number.

It is an amenable number.

159669621 is a deficient number, since it is larger than the sum of its proper divisors (91140939).

159669621 is a wasteful number, since it uses less digits than its factorization.

159669621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466 (or 463 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 159669621 is about 12636.0445155911. The cubic root of 159669621 is about 542.5096047625.

It can be divided in two parts, 1596 and 69621, that added together give a palindrome (71217).

The spelling of 159669621 in words is "one hundred fifty-nine million, six hundred sixty-nine thousand, six hundred twenty-one".