164451663 has 18 divisors (see below), whose sum is σ = 246026144. Its totient is φ = 105849072.

The previous prime is 164451653. The next prime is 164451671. The reversal of 164451663 is 366154461.

It is a happy number.

164451663 is a `hidden beast` number, since 1 + 644 + 5 + 1 + 6 + 6 + 3 = 666.

It is not a de Polignac number, because 164451663 - 2⁴ = 164451647 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 (164451613) 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, 3295 + ... + 18432.

Almost surely, 2^164451663 is an apocalyptic number.

164451663 is a deficient number, since it is larger than the sum of its proper divisors (81574481).

164451663 is a wasteful number, since it uses less digits than its factorization.

164451663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21791 (or 21759 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 164451663 is about 12823.8708274842. The cubic root of 164451663 is about 547.8724006730.

The spelling of 164451663 in words is "one hundred sixty-four million, four hundred fifty-one thousand, six hundred sixty-three".