66837378863 has 2 divisors, whose sum is σ = 66837378864. Its totient is φ = 66837378862.

The previous prime is 66837378859. The next prime is 66837378889. The reversal of 66837378863 is 36887373866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66837378863 - 2² = 66837378859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66837378863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66836378863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33418689431 + 33418689432.

It is an arithmetic number, because the mean of its divisors is an integer number (33418689432).

Almost surely, 2^66837378863 is an apocalyptic number.

66837378863 is a deficient number, since it is larger than the sum of its proper divisors (1).

66837378863 is an equidigital number, since it uses as much as digits as its factorization.

66837378863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 146313216, while the sum is 65.

The spelling of 66837378863 in words is "sixty-six billion, eight hundred thirty-seven million, three hundred seventy-eight thousand, eight hundred sixty-three".