66674067961 has 2 divisors, whose sum is σ = 66674067962. Its totient is φ = 66674067960.

The previous prime is 66674067913. The next prime is 66674067989. The reversal of 66674067961 is 16976047666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59404800361 + 7269267600 = 243731^2 + 85260^2 .

It is a cyclic number.

It is not a de Polignac number, because 66674067961 - 2¹³ = 66674059769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66674067896 and 66674067905.

It is not a weakly prime, because it can be changed into another prime (66674017961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33337033980 + 33337033981.

It is an arithmetic number, because the mean of its divisors is an integer number (33337033981).

Almost surely, 2^66674067961 is an apocalyptic number.

It is an amenable number.

66674067961 is a deficient number, since it is larger than the sum of its proper divisors (1).

66674067961 is an equidigital number, since it uses as much as digits as its factorization.

66674067961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13716864, while the sum is 58.

The spelling of 66674067961 in words is "sixty-six billion, six hundred seventy-four million, sixty-seven thousand, nine hundred sixty-one".