63666443 has 4 divisors (see below), whose sum is σ = 63712608. Its totient is φ = 63620280.

The previous prime is 63666437. The next prime is 63666469. The reversal of 63666443 is 34466636.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63666443 is a prime.

It is a super-3 number, since 3×63666443³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63666397 and 63666406.

It is not an unprimeable number, because it can be changed into a prime (63666403) 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, 20948 + ... + 23793.

It is an arithmetic number, because the mean of its divisors is an integer number (15928152).

Almost surely, 2^63666443 is an apocalyptic number.

63666443 is a deficient number, since it is larger than the sum of its proper divisors (46165).

63666443 is a wasteful number, since it uses less digits than its factorization.

63666443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46164.

The product of its digits is 186624, while the sum is 38.

The square root of 63666443 is about 7979.1254533313. The cubic root of 63666443 is about 399.3038788244.

The spelling of 63666443 in words is "sixty-three million, six hundred sixty-six thousand, four hundred forty-three".