89778985643 has 2 divisors, whose sum is σ = 89778985644. Its totient is φ = 89778985642.

The previous prime is 89778985613. The next prime is 89778985663. The reversal of 89778985643 is 34658987798.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89778985643 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (89778985603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44889492821 + 44889492822.

It is an arithmetic number, because the mean of its divisors is an integer number (44889492822).

Almost surely, 2^89778985643 is an apocalyptic number.

89778985643 is a deficient number, since it is larger than the sum of its proper divisors (1).

89778985643 is an equidigital number, since it uses as much as digits as its factorization.

89778985643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 731566080, while the sum is 74.

The spelling of 89778985643 in words is "eighty-nine billion, seven hundred seventy-eight million, nine hundred eighty-five thousand, six hundred forty-three".