1638115474139 has 2 divisors, whose sum is σ = 1638115474140. Its totient is φ = 1638115474138.

The previous prime is 1638115474109. The next prime is 1638115474147. The reversal of 1638115474139 is 9314745118361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1638115474139 - 2¹⁶ = 1638115408603 is a prime.

It is a super-2 number, since 2×1638115474139² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1638115474109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819057737069 + 819057737070.

It is an arithmetic number, because the mean of its divisors is an integer number (819057737070).

Almost surely, 2^{1638115474139} is an apocalyptic number.

1638115474139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638115474139 is an equidigital number, since it uses as much as digits as its factorization.

1638115474139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The spelling of 1638115474139 in words is "one trillion, six hundred thirty-eight billion, one hundred fifteen million, four hundred seventy-four thousand, one hundred thirty-nine".