66733403687 has 2 divisors, whose sum is σ = 66733403688. Its totient is φ = 66733403686.

The previous prime is 66733403591. The next prime is 66733403731. The reversal of 66733403687 is 78630433766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66733403687 - 2²⁶ = 66666294823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66733103687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33366701843 + 33366701844.

It is an arithmetic number, because the mean of its divisors is an integer number (33366701844).

Almost surely, 2^66733403687 is an apocalyptic number.

66733403687 is a deficient number, since it is larger than the sum of its proper divisors (1).

66733403687 is an equidigital number, since it uses as much as digits as its factorization.

66733403687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9144576, while the sum is 53.

The spelling of 66733403687 in words is "sixty-six billion, seven hundred thirty-three million, four hundred three thousand, six hundred eighty-seven".