66363643 has 4 divisors (see below), whose sum is σ = 67272808. Its totient is φ = 65454480.

The previous prime is 66363623. The next prime is 66363679. The reversal of 66363643 is 34636366.

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

It is a cyclic number.

It is not a de Polignac number, because 66363643 - 2⁵ = 66363611 is a prime.

It is a super-2 number, since 2×66363643² = 8808266224462898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66363623) 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, 454473 + ... + 454618.

It is an arithmetic number, because the mean of its divisors is an integer number (16818202).

Almost surely, 2^66363643 is an apocalyptic number.

66363643 is a deficient number, since it is larger than the sum of its proper divisors (909165).

66363643 is an equidigital number, since it uses as much as digits as its factorization.

66363643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909164.

The product of its digits is 139968, while the sum is 37.

The square root of 66363643 is about 8146.3883408539. The cubic root of 66363643 is about 404.8648494837.

The spelling of 66363643 in words is "sixty-six million, three hundred sixty-three thousand, six hundred forty-three".