12500000138777 has 2 divisors, whose sum is σ = 12500000138778. Its totient is φ = 12500000138776.

The previous prime is 12500000138699. The next prime is 12500000138783. The reversal of 12500000138777 is 77783100000521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12176024021056 + 323976117721 = 3489416^2 + 569189^2 .

It is a cyclic number.

It is not a de Polignac number, because 12500000138777 - 2¹² = 12500000134681 is a prime.

It is not a weakly prime, because it can be changed into another prime (12500000137777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6250000069388 + 6250000069389.

It is an arithmetic number, because the mean of its divisors is an integer number (6250000069389).

Almost surely, 2^{12500000138777} is an apocalyptic number.

It is an amenable number.

12500000138777 is a deficient number, since it is larger than the sum of its proper divisors (1).

12500000138777 is an equidigital number, since it uses as much as digits as its factorization.

12500000138777 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 12500000138777 in words is "twelve trillion, five hundred billion, one hundred thirty-eight thousand, seven hundred seventy-seven".