66231554437 has 2 divisors, whose sum is σ = 66231554438. Its totient is φ = 66231554436.

The previous prime is 66231554399. The next prime is 66231554449. The reversal of 66231554437 is 73445513266.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54046485441 + 12185068996 = 232479^2 + 110386^2 .

It is a cyclic number.

It is not a de Polignac number, because 66231554437 - 2¹⁹ = 66231030149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66231551437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33115777218 + 33115777219.

It is an arithmetic number, because the mean of its divisors is an integer number (33115777219).

Almost surely, 2^66231554437 is an apocalyptic number.

It is an amenable number.

66231554437 is a deficient number, since it is larger than the sum of its proper divisors (1).

66231554437 is an equidigital number, since it uses as much as digits as its factorization.

66231554437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 46.

The spelling of 66231554437 in words is "sixty-six billion, two hundred thirty-one million, five hundred fifty-four thousand, four hundred thirty-seven".