66670000039969 has 2 divisors, whose sum is σ = 66670000039970. Its totient is φ = 66670000039968.

The previous prime is 66670000039921. The next prime is 66670000040047. The reversal of 66670000039969 is 96993000007666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48098899303569 + 18571100736400 = 6935337^2 + 4309420^2 .

It is a cyclic number.

It is not a de Polignac number, because 66670000039969 - 2¹³ = 66670000031777 is a prime.

It is a super-2 number, since 2×66670000039969² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66670000069969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335000019984 + 33335000019985.

It is an arithmetic number, because the mean of its divisors is an integer number (33335000019985).

Almost surely, 2^{66670000039969} is an apocalyptic number.

It is an amenable number.

66670000039969 is a deficient number, since it is larger than the sum of its proper divisors (1).

66670000039969 is an equidigital number, since it uses as much as digits as its factorization.

66670000039969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19840464, while the sum is 61.

The spelling of 66670000039969 in words is "sixty-six trillion, six hundred seventy billion, thirty-nine thousand, nine hundred sixty-nine".