6691090493 has 2 divisors, whose sum is σ = 6691090494. Its totient is φ = 6691090492.

The previous prime is 6691090477. The next prime is 6691090507. The reversal of 6691090493 is 3940901966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4659154564 + 2031935929 = 68258^2 + 45077^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691090493 - 2⁴ = 6691090477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6691092493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345545246 + 3345545247.

It is an arithmetic number, because the mean of its divisors is an integer number (3345545247).

Almost surely, 2^6691090493 is an apocalyptic number.

It is an amenable number.

6691090493 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691090493 is an equidigital number, since it uses as much as digits as its factorization.

6691090493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 6691090493 is about 81799.0861379270. The cubic root of 6691090493 is about 1884.3676267655.

The spelling of 6691090493 in words is "six billion, six hundred ninety-one million, ninety thousand, four hundred ninety-three".