66233131477 has 2 divisors, whose sum is σ = 66233131478. Its totient is φ = 66233131476.

The previous prime is 66233131457. The next prime is 66233131583. The reversal of 66233131477 is 77413133266.

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., 64991344356 + 1241787121 = 254934^2 + 35239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66233131477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66233131427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33116565738 + 33116565739.

It is an arithmetic number, because the mean of its divisors is an integer number (33116565739).

Almost surely, 2^66233131477 is an apocalyptic number.

It is an amenable number.

66233131477 is a deficient number, since it is larger than the sum of its proper divisors (1).

66233131477 is an equidigital number, since it uses as much as digits as its factorization.

66233131477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 43.

The spelling of 66233131477 in words is "sixty-six billion, two hundred thirty-three million, one hundred thirty-one thousand, four hundred seventy-seven".