7779400778467 has 2 divisors, whose sum is σ = 7779400778468. Its totient is φ = 7779400778466.

The previous prime is 7779400778411. The next prime is 7779400778473. The reversal of 7779400778467 is 7648770049777.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7779400778467 is a prime.

It is a super-2 number, since 2×7779400778467² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7779400778467.

It is not a weakly prime, because it can be changed into another prime (7779400778167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3889700389233 + 3889700389234.

It is an arithmetic number, because the mean of its divisors is an integer number (3889700389234).

Almost surely, 2^{7779400778467} is an apocalyptic number.

7779400778467 is a deficient number, since it is larger than the sum of its proper divisors (1).

7779400778467 is an equidigital number, since it uses as much as digits as its factorization.

7779400778467 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 813189888, while the sum is 73.

The spelling of 7779400778467 in words is "seven trillion, seven hundred seventy-nine billion, four hundred million, seven hundred seventy-eight thousand, four hundred sixty-seven".