78077125013 has 2 divisors, whose sum is σ = 78077125014. Its totient is φ = 78077125012.

The previous prime is 78077124947. The next prime is 78077125031. The reversal of 78077125013 is 31052177087.

Together with next prime (78077125031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64058091409 + 14019033604 = 253097^2 + 118402^2 .

It is a cyclic number.

It is not a de Polignac number, because 78077125013 - 2²² = 78072930709 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78077125813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39038562506 + 39038562507.

It is an arithmetic number, because the mean of its divisors is an integer number (39038562507).

Almost surely, 2^78077125013 is an apocalyptic number.

It is an amenable number.

78077125013 is a deficient number, since it is larger than the sum of its proper divisors (1).

78077125013 is an equidigital number, since it uses as much as digits as its factorization.

78077125013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82320, while the sum is 41.

The spelling of 78077125013 in words is "seventy-eight billion, seventy-seven million, one hundred twenty-five thousand, thirteen".