2178649291811 has 2 divisors, whose sum is σ = 2178649291812. Its totient is φ = 2178649291810.

The previous prime is 2178649291799. The next prime is 2178649291837. The reversal of 2178649291811 is 1181929468712.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2178649291811 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2178649299811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089324645905 + 1089324645906.

It is an arithmetic number, because the mean of its divisors is an integer number (1089324645906).

Almost surely, 2^{2178649291811} is an apocalyptic number.

2178649291811 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178649291811 is an equidigital number, since it uses as much as digits as its factorization.

2178649291811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 59.

The spelling of 2178649291811 in words is "two trillion, one hundred seventy-eight billion, six hundred forty-nine million, two hundred ninety-one thousand, eight hundred eleven".