7942189643 has 2 divisors, whose sum is σ = 7942189644. Its totient is φ = 7942189642.

The previous prime is 7942189631. The next prime is 7942189657. The reversal of 7942189643 is 3469812497.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7942189643 - 2⁴ = 7942189627 is a prime.

It is not a weakly prime, because it can be changed into another prime (7942189043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3971094821 + 3971094822.

It is an arithmetic number, because the mean of its divisors is an integer number (3971094822).

Almost surely, 2^7942189643 is an apocalyptic number.

7942189643 is a deficient number, since it is larger than the sum of its proper divisors (1).

7942189643 is an equidigital number, since it uses as much as digits as its factorization.

7942189643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 53.

The square root of 7942189643 is about 89118.9634309107. The cubic root of 7942189643 is about 1995.1708191412.

The spelling of 7942189643 in words is "seven billion, nine hundred forty-two million, one hundred eighty-nine thousand, six hundred forty-three".