6197211661 has 2 divisors, whose sum is σ = 6197211662. Its totient is φ = 6197211660.

The previous prime is 6197211583. The next prime is 6197211679. The reversal of 6197211661 is 1661127916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5199852100 + 997359561 = 72110^2 + 31581^2 .

It is a cyclic number.

It is not a de Polignac number, because 6197211661 - 2⁷ = 6197211533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6197211061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3098605830 + 3098605831.

It is an arithmetic number, because the mean of its divisors is an integer number (3098605831).

Almost surely, 2^6197211661 is an apocalyptic number.

It is an amenable number.

6197211661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6197211661 is an equidigital number, since it uses as much as digits as its factorization.

6197211661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 6197211661 is about 78722.3707785786. The cubic root of 6197211661 is about 1836.8151091902.

The spelling of 6197211661 in words is "six billion, one hundred ninety-seven million, two hundred eleven thousand, six hundred sixty-one".