6611899397 has 2 divisors, whose sum is σ = 6611899398. Its totient is φ = 6611899396.

The previous prime is 6611899351. The next prime is 6611899409. The reversal of 6611899397 is 7939981166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5312368996 + 1299530401 = 72886^2 + 36049^2 .

It is a cyclic number.

It is not a de Polignac number, because 6611899397 - 2⁸ = 6611899141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6611899337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305949698 + 3305949699.

It is an arithmetic number, because the mean of its divisors is an integer number (3305949699).

Almost surely, 2^6611899397 is an apocalyptic number.

It is an amenable number.

6611899397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6611899397 is an equidigital number, since it uses as much as digits as its factorization.

6611899397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 59.

The square root of 6611899397 is about 81313.5867921223. The cubic root of 6611899397 is about 1876.9040826299.

The spelling of 6611899397 in words is "six billion, six hundred eleven million, eight hundred ninety-nine thousand, three hundred ninety-seven".