666783479 has 2 divisors, whose sum is σ = 666783480. Its totient is φ = 666783478.

The previous prime is 666783443. The next prime is 666783487. The reversal of 666783479 is 974387666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666783479 - 2¹⁶ = 666717943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666783419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333391739 + 333391740.

It is an arithmetic number, because the mean of its divisors is an integer number (333391740).

Almost surely, 2^666783479 is an apocalyptic number.

666783479 is a deficient number, since it is larger than the sum of its proper divisors (1).

666783479 is an equidigital number, since it uses as much as digits as its factorization.

666783479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 56.

The square root of 666783479 is about 25822.1509367442. The cubic root of 666783479 is about 873.6314842428.

The spelling of 666783479 in words is "six hundred sixty-six million, seven hundred eighty-three thousand, four hundred seventy-nine".