6899255989 has 2 divisors, whose sum is σ = 6899255990. Its totient is φ = 6899255988.

The previous prime is 6899255983. The next prime is 6899256031. The reversal of 6899255989 is 9895529986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3870955089 + 3028300900 = 62217^2 + 55030^2 .

It is a cyclic number.

It is not a de Polignac number, because 6899255989 - 2⁷ = 6899255861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6899255983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3449627994 + 3449627995.

It is an arithmetic number, because the mean of its divisors is an integer number (3449627995).

Almost surely, 2^6899255989 is an apocalyptic number.

It is an amenable number.

6899255989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6899255989 is an equidigital number, since it uses as much as digits as its factorization.

6899255989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125971200, while the sum is 70.

The square root of 6899255989 is about 83061.7600885028. The cubic root of 6899255989 is about 1903.7098328386.

The spelling of 6899255989 in words is "six billion, eight hundred ninety-nine million, two hundred fifty-five thousand, nine hundred eighty-nine".