6691562741 has 2 divisors, whose sum is σ = 6691562742. Its totient is φ = 6691562740.

The previous prime is 6691562737. The next prime is 6691562749. The reversal of 6691562741 is 1472651966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3451562500 + 3240000241 = 58750^2 + 56921^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691562741 - 2² = 6691562737 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6691562749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345781370 + 3345781371.

It is an arithmetic number, because the mean of its divisors is an integer number (3345781371).

Almost surely, 2^6691562741 is an apocalyptic number.

It is an amenable number.

6691562741 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691562741 is an equidigital number, since it uses as much as digits as its factorization.

6691562741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 6691562741 is about 81801.9727207113. The cubic root of 6691562741 is about 1884.4119577511.

The spelling of 6691562741 in words is "six billion, six hundred ninety-one million, five hundred sixty-two thousand, seven hundred forty-one".