66206407 has 2 divisors, whose sum is σ = 66206408. Its totient is φ = 66206406.

The previous prime is 66206339. The next prime is 66206417. The reversal of 66206407 is 70460266.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66206407 is a prime.

It is equal to p_3907642 and since 66206407 and 3907642 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66206417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33103203 + 33103204.

It is an arithmetic number, because the mean of its divisors is an integer number (33103204).

Almost surely, 2^66206407 is an apocalyptic number.

66206407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66206407 is an equidigital number, since it uses as much as digits as its factorization.

66206407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 66206407 is about 8136.7319606830. The cubic root of 66206407 is about 404.5448465971.

The spelling of 66206407 in words is "sixty-six million, two hundred six thousand, four hundred seven".