78493799771 has 2 divisors, whose sum is σ = 78493799772. Its totient is φ = 78493799770.

The previous prime is 78493799737. The next prime is 78493799819. The reversal of 78493799771 is 17799739487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78493799771 - 2¹⁴ = 78493783387 is a prime.

It is a super-2 number, since 2×78493799771² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78493799695 and 78493799704.

It is not a weakly prime, because it can be changed into another prime (78493799701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39246899885 + 39246899886.

It is an arithmetic number, because the mean of its divisors is an integer number (39246899886).

Almost surely, 2^78493799771 is an apocalyptic number.

78493799771 is a deficient number, since it is larger than the sum of its proper divisors (1).

78493799771 is an equidigital number, since it uses as much as digits as its factorization.

78493799771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168031584, while the sum is 71.

The spelling of 78493799771 in words is "seventy-eight billion, four hundred ninety-three million, seven hundred ninety-nine thousand, seven hundred seventy-one".