7887617278129 has 2 divisors, whose sum is σ = 7887617278130. Its totient is φ = 7887617278128.

The previous prime is 7887617278109. The next prime is 7887617278183. The reversal of 7887617278129 is 9218727167887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4069188631729 + 3818428646400 = 2017223^2 + 1954080^2 .

It is an emirp because it is prime and its reverse (9218727167887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7887617278129 - 2⁷ = 7887617278001 is a prime.

It is not a weakly prime, because it can be changed into another prime (7887617278109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3943808639064 + 3943808639065.

It is an arithmetic number, because the mean of its divisors is an integer number (3943808639065).

Almost surely, 2^{7887617278129} is an apocalyptic number.

It is an amenable number.

7887617278129 is a deficient number, since it is larger than the sum of its proper divisors (1).

7887617278129 is an equidigital number, since it uses as much as digits as its factorization.

7887617278129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 265531392, while the sum is 73.

The spelling of 7887617278129 in words is "seven trillion, eight hundred eighty-seven billion, six hundred seventeen million, two hundred seventy-eight thousand, one hundred twenty-nine".