66200643 has 6 divisors (see below), whose sum is σ = 95623164. Its totient is φ = 44133756.

The previous prime is 66200639. The next prime is 66200653. The reversal of 66200643 is 34600266.

It is not a de Polignac number, because 66200643 - 2² = 66200639 is a prime.

It is a super-2 number, since 2×66200643² = 8765050267226898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66200633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3677805 + ... + 3677822.

It is an arithmetic number, because the mean of its divisors is an integer number (15937194).

Almost surely, 2^66200643 is an apocalyptic number.

66200643 is a deficient number, since it is larger than the sum of its proper divisors (29422521).

66200643 is a wasteful number, since it uses less digits than its factorization.

66200643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7355633 (or 7355630 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 66200643 is about 8136.3777567171. The cubic root of 66200643 is about 404.5331062220.

The spelling of 66200643 in words is "sixty-six million, two hundred thousand, six hundred forty-three".