63166021 has 4 divisors (see below), whose sum is σ = 63182412. Its totient is φ = 63149632.

The previous prime is 63166009. The next prime is 63166039. The reversal of 63166021 is 12066136.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35224225 + 27941796 = 5935^2 + 5286^2 .

It is a cyclic number.

It is not a de Polignac number, because 63166021 - 2²³ = 54777413 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 (63166001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1101 + ... + 11293.

It is an arithmetic number, because the mean of its divisors is an integer number (15795603).

Almost surely, 2^63166021 is an apocalyptic number.

It is an amenable number.

63166021 is a deficient number, since it is larger than the sum of its proper divisors (16391).

63166021 is a wasteful number, since it uses less digits than its factorization.

63166021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16390.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 63166021 is about 7947.7053921242. The cubic root of 63166021 is about 398.2549417503.

The spelling of 63166021 in words is "sixty-three million, one hundred sixty-six thousand, twenty-one".