16138654121 has 2 divisors, whose sum is σ = 16138654122. Its totient is φ = 16138654120.

The previous prime is 16138654109. The next prime is 16138654139. The reversal of 16138654121 is 12145683161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13674028096 + 2464626025 = 116936^2 + 49645^2 .

It is a cyclic number.

It is not a de Polignac number, because 16138654121 - 2¹⁸ = 16138391977 is a prime.

It is not a weakly prime, because it can be changed into another prime (16138653121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8069327060 + 8069327061.

It is an arithmetic number, because the mean of its divisors is an integer number (8069327061).

Almost surely, 2^16138654121 is an apocalyptic number.

It is an amenable number.

16138654121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16138654121 is an equidigital number, since it uses as much as digits as its factorization.

16138654121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 38.

The spelling of 16138654121 in words is "sixteen billion, one hundred thirty-eight million, six hundred fifty-four thousand, one hundred twenty-one".