2663994391 has 2 divisors, whose sum is σ = 2663994392. Its totient is φ = 2663994390.

The previous prime is 2663994371. The next prime is 2663994407. The reversal of 2663994391 is 1934993662.

2663994391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2663994391 - 2²¹ = 2661897239 is a prime.

It is a super-2 number, since 2×2663994391² = 14193732230558921762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2663994341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1331997195 + 1331997196.

It is an arithmetic number, because the mean of its divisors is an integer number (1331997196).

Almost surely, 2^2663994391 is an apocalyptic number.

2663994391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2663994391 is an equidigital number, since it uses as much as digits as its factorization.

2663994391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 52.

The square root of 2663994391 is about 51613.8972661434. The cubic root of 2663994391 is about 1386.2591807705.

The spelling of 2663994391 in words is "two billion, six hundred sixty-three million, nine hundred ninety-four thousand, three hundred ninety-one".