7138123774987 has 2 divisors, whose sum is σ = 7138123774988. Its totient is φ = 7138123774986.

The previous prime is 7138123774897. The next prime is 7138123775051. The reversal of 7138123774987 is 7894773218317.

7138123774987 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (7138123774897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7138123774987 - 2³⁹ = 6588367961099 is a prime.

It is a super-2 number, since 2×7138123774987² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7138123774687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3569061887493 + 3569061887494.

It is an arithmetic number, because the mean of its divisors is an integer number (3569061887494).

Almost surely, 2^{7138123774987} is an apocalyptic number.

7138123774987 is a deficient number, since it is larger than the sum of its proper divisors (1).

7138123774987 is an equidigital number, since it uses as much as digits as its factorization.

7138123774987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99574272, while the sum is 67.

The spelling of 7138123774987 in words is "seven trillion, one hundred thirty-eight billion, one hundred twenty-three million, seven hundred seventy-four thousand, nine hundred eighty-seven".