12538861667 has 2 divisors, whose sum is σ = 12538861668. Its totient is φ = 12538861666.

The previous prime is 12538861651. The next prime is 12538861711. The reversal of 12538861667 is 76616883521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12538861667 - 2⁴ = 12538861651 is a prime.

It is not a weakly prime, because it can be changed into another prime (12538861967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6269430833 + 6269430834.

It is an arithmetic number, because the mean of its divisors is an integer number (6269430834).

Almost surely, 2^12538861667 is an apocalyptic number.

12538861667 is a deficient number, since it is larger than the sum of its proper divisors (1).

12538861667 is an equidigital number, since it uses as much as digits as its factorization.

12538861667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 53.

The spelling of 12538861667 in words is "twelve billion, five hundred thirty-eight million, eight hundred sixty-one thousand, six hundred sixty-seven".