66323714481491 has 2 divisors, whose sum is σ = 66323714481492. Its totient is φ = 66323714481490.

The previous prime is 66323714481383. The next prime is 66323714481499. The reversal of 66323714481491 is 19418441732366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66323714481491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66323714481491.

It is not a weakly prime, because it can be changed into another prime (66323714481499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33161857240745 + 33161857240746.

It is an arithmetic number, because the mean of its divisors is an integer number (33161857240746).

Almost surely, 2^{66323714481491} is an apocalyptic number.

66323714481491 is a deficient number, since it is larger than the sum of its proper divisors (1).

66323714481491 is an equidigital number, since it uses as much as digits as its factorization.

66323714481491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 59.

The spelling of 66323714481491 in words is "sixty-six trillion, three hundred twenty-three billion, seven hundred fourteen million, four hundred eighty-one thousand, four hundred ninety-one".