66206404 has 12 divisors (see below), whose sum is σ = 126394128. Its totient is φ = 30093800.

The previous prime is 66206339. The next prime is 66206407. The reversal of 66206404 is 40460266.

It is a super-2 number, since 2×66206404² = 8766575861222432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66206407) 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, 752302 + ... + 752389.

It is an arithmetic number, because the mean of its divisors is an integer number (10532844).

Almost surely, 2^66206404 is an apocalyptic number.

It is an amenable number.

66206404 is a deficient number, since it is larger than the sum of its proper divisors (60187724).

66206404 is a wasteful number, since it uses less digits than its factorization.

66206404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504706 (or 1504704 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66206404 is about 8136.7317763338. The cubic root of 66206404 is about 404.5448404868.

The spelling of 66206404 in words is "sixty-six million, two hundred six thousand, four hundred four".