6697779161 has 2 divisors, whose sum is σ = 6697779162. Its totient is φ = 6697779160.

The previous prime is 6697779113. The next prime is 6697779203. The reversal of 6697779161 is 1619777966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4388400025 + 2309379136 = 66245^2 + 48056^2 .

It is a cyclic number.

It is not a de Polignac number, because 6697779161 - 2²² = 6693584857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6697779161.

It is not a weakly prime, because it can be changed into another prime (6697772161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3348889580 + 3348889581.

It is an arithmetic number, because the mean of its divisors is an integer number (3348889581).

Almost surely, 2^6697779161 is an apocalyptic number.

It is an amenable number.

6697779161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6697779161 is an equidigital number, since it uses as much as digits as its factorization.

6697779161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6001128, while the sum is 59.

The square root of 6697779161 is about 81839.9606610365. The cubic root of 6697779161 is about 1884.9953127910.

The spelling of 6697779161 in words is "six billion, six hundred ninety-seven million, seven hundred seventy-nine thousand, one hundred sixty-one".