6691140451 has 2 divisors, whose sum is σ = 6691140452. Its totient is φ = 6691140450.

The previous prime is 6691140437. The next prime is 6691140497. The reversal of 6691140451 is 1540411966.

6691140451 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 6691140451 - 2²¹ = 6689043299 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6691140451.

It is not a weakly prime, because it can be changed into another prime (6691140751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345570225 + 3345570226.

It is an arithmetic number, because the mean of its divisors is an integer number (3345570226).

Almost surely, 2^6691140451 is an apocalyptic number.

6691140451 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691140451 is an equidigital number, since it uses as much as digits as its factorization.

6691140451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 6691140451 is about 81799.3915075167. The cubic root of 6691140451 is about 1884.3723165344.

The spelling of 6691140451 in words is "six billion, six hundred ninety-one million, one hundred forty thousand, four hundred fifty-one".