6455516891 has 2 divisors, whose sum is σ = 6455516892. Its totient is φ = 6455516890.

The previous prime is 6455516797. The next prime is 6455516897. The reversal of 6455516891 is 1986155546.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6455516891 - 2¹⁸ = 6455254747 is a prime.

It is not a weakly prime, because it can be changed into another prime (6455516897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3227758445 + 3227758446.

It is an arithmetic number, because the mean of its divisors is an integer number (3227758446).

Almost surely, 2^6455516891 is an apocalyptic number.

6455516891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6455516891 is an equidigital number, since it uses as much as digits as its factorization.

6455516891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296000, while the sum is 50.

The square root of 6455516891 is about 80346.2313428576. The cubic root of 6455516891 is about 1861.9885553100.

The spelling of 6455516891 in words is "six billion, four hundred fifty-five million, five hundred sixteen thousand, eight hundred ninety-one".