63166721 has 2 divisors, whose sum is σ = 63166722. Its totient is φ = 63166720.

The previous prime is 63166709. The next prime is 63166739. The reversal of 63166721 is 12766136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59598400 + 3568321 = 7720^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 63166721 - 2¹⁴ = 63150337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63166751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31583360 + 31583361.

It is an arithmetic number, because the mean of its divisors is an integer number (31583361).

Almost surely, 2^63166721 is an apocalyptic number.

It is an amenable number.

63166721 is a deficient number, since it is larger than the sum of its proper divisors (1).

63166721 is an equidigital number, since it uses as much as digits as its factorization.

63166721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 63166721 is about 7947.7494298701. The cubic root of 63166721 is about 398.2564128863.

The spelling of 63166721 in words is "sixty-three million, one hundred sixty-six thousand, seven hundred twenty-one".