18946880861 has 2 divisors, whose sum is σ = 18946880862. Its totient is φ = 18946880860.

The previous prime is 18946880819. The next prime is 18946880903. The reversal of 18946880861 is 16808864981.

It is a balanced prime because it is at equal distance from previous prime (18946880819) and next prime (18946880903).

It can be written as a sum of positive squares in only one way, i.e., 11562915961 + 7383964900 = 107531^2 + 85930^2 .

It is a cyclic number.

It is not a de Polignac number, because 18946880861 - 2³⁴ = 1767011677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18946880861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18946880261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9473440430 + 9473440431.

It is an arithmetic number, because the mean of its divisors is an integer number (9473440431).

Almost surely, 2^18946880861 is an apocalyptic number.

It is an amenable number.

18946880861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18946880861 is an equidigital number, since it uses as much as digits as its factorization.

18946880861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5308416, while the sum is 59.

The spelling of 18946880861 in words is "eighteen billion, nine hundred forty-six million, eight hundred eighty thousand, eight hundred sixty-one".