66364693 has 2 divisors, whose sum is σ = 66364694. Its totient is φ = 66364692.

The previous prime is 66364687. The next prime is 66364699. The reversal of 66364693 is 39646366.

It is a balanced prime because it is at equal distance from previous prime (66364687) and next prime (66364699).

It can be written as a sum of positive squares in only one way, i.e., 34363044 + 32001649 = 5862^2 + 5657^2 .

It is a cyclic number.

It is not a de Polignac number, because 66364693 - 2¹³ = 66356501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66364699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33182346 + 33182347.

It is an arithmetic number, because the mean of its divisors is an integer number (33182347).

Almost surely, 2^66364693 is an apocalyptic number.

It is an amenable number.

66364693 is a deficient number, since it is larger than the sum of its proper divisors (1).

66364693 is an equidigital number, since it uses as much as digits as its factorization.

66364693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 43.

The square root of 66364693 is about 8146.4527863359. The cubic root of 66364693 is about 404.8669847183.

It can be divided in two parts, 663 and 64693, that added together give a palindrome (65356).

The spelling of 66364693 in words is "sixty-six million, three hundred sixty-four thousand, six hundred ninety-three".