6735640991 has 2 divisors, whose sum is σ = 6735640992. Its totient is φ = 6735640990.

The previous prime is 6735640979. The next prime is 6735641021. The reversal of 6735640991 is 1990465376.

6735640991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6735640991 - 2²⁶ = 6668532127 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6735640921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3367820495 + 3367820496.

It is an arithmetic number, because the mean of its divisors is an integer number (3367820496).

Almost surely, 2^6735640991 is an apocalyptic number.

6735640991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6735640991 is an equidigital number, since it uses as much as digits as its factorization.

6735640991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The square root of 6735640991 is about 82070.9509570835. The cubic root of 6735640991 is about 1888.5405332777.

The spelling of 6735640991 in words is "six billion, seven hundred thirty-five million, six hundred forty thousand, nine hundred ninety-one".