2666616397 has 2 divisors, whose sum is σ = 2666616398. Its totient is φ = 2666616396.

The previous prime is 2666616391. The next prime is 2666616437. The reversal of 2666616397 is 7936166662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1361167236 + 1305449161 = 36894^2 + 36131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2666616397 is a prime.

It is a super-2 number, since 2×2666616397² = 14221686017498523218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666616391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333308198 + 1333308199.

It is an arithmetic number, because the mean of its divisors is an integer number (1333308199).

Almost surely, 2^2666616397 is an apocalyptic number.

It is an amenable number.

2666616397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666616397 is an equidigital number, since it uses as much as digits as its factorization.

2666616397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 52.

The square root of 2666616397 is about 51639.2912131838. The cubic root of 2666616397 is about 1386.7138348865.

The spelling of 2666616397 in words is "two billion, six hundred sixty-six million, six hundred sixteen thousand, three hundred ninety-seven".