66823401401 has 2 divisors, whose sum is σ = 66823401402. Its totient is φ = 66823401400.

The previous prime is 66823401397. The next prime is 66823401427. The reversal of 66823401401 is 10410432866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64335786025 + 2487615376 = 253645^2 + 49876^2 .

It is a cyclic number.

It is not a de Polignac number, because 66823401401 - 2² = 66823401397 is a prime.

It is not a weakly prime, because it can be changed into another prime (66823400401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33411700700 + 33411700701.

It is an arithmetic number, because the mean of its divisors is an integer number (33411700701).

Almost surely, 2^66823401401 is an apocalyptic number.

It is an amenable number.

66823401401 is a deficient number, since it is larger than the sum of its proper divisors (1).

66823401401 is an equidigital number, since it uses as much as digits as its factorization.

66823401401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 66823401401 in words is "sixty-six billion, eight hundred twenty-three million, four hundred one thousand, four hundred one".