778275500017 has 2 divisors, whose sum is σ = 778275500018. Its totient is φ = 778275500016.

The previous prime is 778275499993. The next prime is 778275500047. The reversal of 778275500017 is 710005572877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619572062641 + 158703437376 = 787129^2 + 398376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778275500017 is a prime.

It is a super-2 number, since 2×778275500017² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (778275500047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389137750008 + 389137750009.

It is an arithmetic number, because the mean of its divisors is an integer number (389137750009).

Almost surely, 2^778275500017 is an apocalyptic number.

It is an amenable number.

778275500017 is a deficient number, since it is larger than the sum of its proper divisors (1).

778275500017 is an equidigital number, since it uses as much as digits as its factorization.

778275500017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960400, while the sum is 49.

The spelling of 778275500017 in words is "seven hundred seventy-eight billion, two hundred seventy-five million, five hundred thousand, seventeen".