18896417861 has 2 divisors, whose sum is σ = 18896417862. Its totient is φ = 18896417860.

The previous prime is 18896417797. The next prime is 18896417873. The reversal of 18896417861 is 16871469881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18893877025 + 2540836 = 137455^2 + 1594^2 .

It is a cyclic number.

It is not a de Polignac number, because 18896417861 - 2⁶ = 18896417797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18896417861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18896417161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9448208930 + 9448208931.

It is an arithmetic number, because the mean of its divisors is an integer number (9448208931).

Almost surely, 2^18896417861 is an apocalyptic number.

It is an amenable number.

18896417861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18896417861 is an equidigital number, since it uses as much as digits as its factorization.

18896417861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 59.

The spelling of 18896417861 in words is "eighteen billion, eight hundred ninety-six million, four hundred seventeen thousand, eight hundred sixty-one".