66889319437 has 2 divisors, whose sum is σ = 66889319438. Its totient is φ = 66889319436.

The previous prime is 66889319407. The next prime is 66889319479. The reversal of 66889319437 is 73491398866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61439041161 + 5450278276 = 247869^2 + 73826^2 .

It is a cyclic number.

It is not a de Polignac number, because 66889319437 - 2¹¹ = 66889317389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66889319407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33444659718 + 33444659719.

It is an arithmetic number, because the mean of its divisors is an integer number (33444659719).

Almost surely, 2^66889319437 is an apocalyptic number.

It is an amenable number.

66889319437 is a deficient number, since it is larger than the sum of its proper divisors (1).

66889319437 is an equidigital number, since it uses as much as digits as its factorization.

66889319437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47029248, while the sum is 64.

The spelling of 66889319437 in words is "sixty-six billion, eight hundred eighty-nine million, three hundred nineteen thousand, four hundred thirty-seven".