78023895017 has 2 divisors, whose sum is σ = 78023895018. Its totient is φ = 78023895016.

The previous prime is 78023895013. The next prime is 78023895091. The reversal of 78023895017 is 71059832087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53574194521 + 24449700496 = 231461^2 + 156364^2 .

It is a cyclic number.

It is not a de Polignac number, because 78023895017 - 2² = 78023895013 is a prime.

It is not a weakly prime, because it can be changed into another prime (78023895013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39011947508 + 39011947509.

It is an arithmetic number, because the mean of its divisors is an integer number (39011947509).

Almost surely, 2^78023895017 is an apocalyptic number.

It is an amenable number.

78023895017 is a deficient number, since it is larger than the sum of its proper divisors (1).

78023895017 is an equidigital number, since it uses as much as digits as its factorization.

78023895017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 78023895017 in words is "seventy-eight billion, twenty-three million, eight hundred ninety-five thousand, seventeen".