66913403287 has 2 divisors, whose sum is σ = 66913403288. Its totient is φ = 66913403286.

The previous prime is 66913403281. The next prime is 66913403303. The reversal of 66913403287 is 78230431966.

66913403287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66913403287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66913403287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66913403281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33456701643 + 33456701644.

It is an arithmetic number, because the mean of its divisors is an integer number (33456701644).

Almost surely, 2^66913403287 is an apocalyptic number.

66913403287 is a deficient number, since it is larger than the sum of its proper divisors (1).

66913403287 is an equidigital number, since it uses as much as digits as its factorization.

66913403287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 66913403287 in words is "sixty-six billion, nine hundred thirteen million, four hundred three thousand, two hundred eighty-seven".