7778494967 has 2 divisors, whose sum is σ = 7778494968. Its totient is φ = 7778494966.

The previous prime is 7778494909. The next prime is 7778494973. The reversal of 7778494967 is 7694948777.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7778494967 - 2¹⁸ = 7778232823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7778494897 and 7778494906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7778494667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3889247483 + 3889247484.

It is an arithmetic number, because the mean of its divisors is an integer number (3889247484).

Almost surely, 2^7778494967 is an apocalyptic number.

7778494967 is a deficient number, since it is larger than the sum of its proper divisors (1).

7778494967 is an equidigital number, since it uses as much as digits as its factorization.

7778494967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 149361408, while the sum is 68.

The square root of 7778494967 is about 88195.7763557870. The cubic root of 7778494967 is about 1981.3682145269.

The spelling of 7778494967 in words is "seven billion, seven hundred seventy-eight million, four hundred ninety-four thousand, nine hundred sixty-seven".