2991780871967 has 2 divisors, whose sum is σ = 2991780871968. Its totient is φ = 2991780871966.

The previous prime is 2991780871897. The next prime is 2991780872029. The reversal of 2991780871967 is 7691780871992.

2991780871967 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 2991780871967 - 2¹² = 2991780867871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2991780871894 and 2991780871903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2991780871267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495890435983 + 1495890435984.

It is an arithmetic number, because the mean of its divisors is an integer number (1495890435984).

Almost surely, 2^{2991780871967} is an apocalyptic number.

2991780871967 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991780871967 is an equidigital number, since it uses as much as digits as its factorization.

2991780871967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192036096, while the sum is 74.

The spelling of 2991780871967 in words is "two trillion, nine hundred ninety-one billion, seven hundred eighty million, eight hundred seventy-one thousand, nine hundred sixty-seven".