16105644857 has 2 divisors, whose sum is σ = 16105644858. Its totient is φ = 16105644856.

The previous prime is 16105644839. The next prime is 16105644869. The reversal of 16105644857 is 75844650161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12218870521 + 3886774336 = 110539^2 + 62344^2 .

It is a cyclic number.

It is not a de Polignac number, because 16105644857 - 2²² = 16101450553 is a prime.

It is not a weakly prime, because it can be changed into another prime (16105644257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8052822428 + 8052822429.

It is an arithmetic number, because the mean of its divisors is an integer number (8052822429).

Almost surely, 2^16105644857 is an apocalyptic number.

It is an amenable number.

16105644857 is a deficient number, since it is larger than the sum of its proper divisors (1).

16105644857 is an equidigital number, since it uses as much as digits as its factorization.

16105644857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 16105644857 in words is "sixteen billion, one hundred five million, six hundred forty-four thousand, eight hundred fifty-seven".