163641465 has 40 divisors (see below), whose sum is σ = 315917448. Its totient is φ = 80559360.

The previous prime is 163641449. The next prime is 163641487. The reversal of 163641465 is 564146361.

It is a happy number.

163641465 is a `hidden beast` number, since 1 + 6 + 3 + 641 + 4 + 6 + 5 = 666.

163641465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 82944 + 163558521 = 288^2 + 12789^2 .

It is not a de Polignac number, because 163641465 - 2⁴ = 163641449 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10276 + ... + 20805.

Almost surely, 2^163641465 is an apocalyptic number.

163641465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163641465 is a deficient number, since it is larger than the sum of its proper divisors (152275983).

163641465 is a wasteful number, since it uses less digits than its factorization.

163641465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31111 (or 31102 counting only the distinct ones).

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

The square root of 163641465 is about 12792.2423757526. The cubic root of 163641465 is about 546.9711914170.

The spelling of 163641465 in words is "one hundred sixty-three million, six hundred forty-one thousand, four hundred sixty-five".