66619673631733 has 2 divisors, whose sum is σ = 66619673631734. Its totient is φ = 66619673631732.

The previous prime is 66619673631673. The next prime is 66619673631773. The reversal of 66619673631733 is 33713637691666.

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., 66488645559249 + 131028072484 = 8154057^2 + 361978^2 .

It is a cyclic number.

It is not a de Polignac number, because 66619673631733 - 2¹³ = 66619673623541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66619673631773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33309836815866 + 33309836815867.

It is an arithmetic number, because the mean of its divisors is an integer number (33309836815867).

Almost surely, 2^{66619673631733} is an apocalyptic number.

It is an amenable number.

66619673631733 is a deficient number, since it is larger than the sum of its proper divisors (1).

66619673631733 is an equidigital number, since it uses as much as digits as its factorization.

66619673631733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 277766496, while the sum is 67.

The spelling of 66619673631733 in words is "sixty-six trillion, six hundred nineteen billion, six hundred seventy-three million, six hundred thirty-one thousand, seven hundred thirty-three".