66954555839 has 2 divisors, whose sum is σ = 66954555840. Its totient is φ = 66954555838.

The previous prime is 66954555769. The next prime is 66954555859. The reversal of 66954555839 is 93855545966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66954555839 - 2¹² = 66954551743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66954555859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33477277919 + 33477277920.

It is an arithmetic number, because the mean of its divisors is an integer number (33477277920).

Almost surely, 2^66954555839 is an apocalyptic number.

66954555839 is a deficient number, since it is larger than the sum of its proper divisors (1).

66954555839 is an equidigital number, since it uses as much as digits as its factorization.

66954555839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960000, while the sum is 65.

The spelling of 66954555839 in words is "sixty-six billion, nine hundred fifty-four million, five hundred fifty-five thousand, eight hundred thirty-nine".