66407701 has 2 divisors, whose sum is σ = 66407702. Its totient is φ = 66407700.

The previous prime is 66407687. The next prime is 66407713. The reversal of 66407701 is 10770466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41667025 + 24740676 = 6455^2 + 4974^2 .

It is a cyclic number.

It is not a de Polignac number, because 66407701 - 2⁵ = 66407669 is a prime.

It is equal to p_3918910 and since 66407701 and 3918910 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 (66407771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33203850 + 33203851.

It is an arithmetic number, because the mean of its divisors is an integer number (33203851).

Almost surely, 2^66407701 is an apocalyptic number.

It is an amenable number.

66407701 is a deficient number, since it is larger than the sum of its proper divisors (1).

66407701 is an equidigital number, since it uses as much as digits as its factorization.

66407701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 66407701 is about 8149.0920353129. The cubic root of 66407701 is about 404.9544245824.

It can be divided in two parts, 6640 and 7701, that added together give a palindrome (14341).

The spelling of 66407701 in words is "sixty-six million, four hundred seven thousand, seven hundred one".