1166213639 has 2 divisors, whose sum is σ = 1166213640. Its totient is φ = 1166213638.

The previous prime is 1166213623. The next prime is 1166213729. The reversal of 1166213639 is 9363126611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1166213639 - 2⁴ = 1166213623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166213239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583106819 + 583106820.

It is an arithmetic number, because the mean of its divisors is an integer number (583106820).

Almost surely, 2^1166213639 is an apocalyptic number.

1166213639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166213639 is an equidigital number, since it uses as much as digits as its factorization.

1166213639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 38.

The square root of 1166213639 is about 34149.8702632968. The cubic root of 1166213639 is about 1052.5903207470.

The spelling of 1166213639 in words is "one billion, one hundred sixty-six million, two hundred thirteen thousand, six hundred thirty-nine".