164421693 has 24 divisors (see below), whose sum is σ = 241998848. Its totient is φ = 107557632.

The previous prime is 164421689. The next prime is 164421701. The reversal of 164421693 is 396124461.

164421693 is a `hidden beast` number, since 1 + 644 + 2 + 1 + 6 + 9 + 3 = 666.

164421693 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 164421693 - 2² = 164421689 is a prime.

It is a super-3 number, since 3×164421693³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164421683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110130 + ... + 111612.

Almost surely, 2^164421693 is an apocalyptic number.

It is an amenable number.

164421693 is a deficient number, since it is larger than the sum of its proper divisors (77577155).

164421693 is a wasteful number, since it uses less digits than its factorization.

164421693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713 (or 1710 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 164421693 is about 12822.7022503059. The cubic root of 164421693 is about 547.8391168637.

The spelling of 164421693 in words is "one hundred sixty-four million, four hundred twenty-one thousand, six hundred ninety-three".