18857880961 has 2 divisors, whose sum is σ = 18857880962. Its totient is φ = 18857880960.

The previous prime is 18857880913. The next prime is 18857881019. The reversal of 18857880961 is 16908875881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13217870961 + 5640010000 = 114969^2 + 75100^2 .

It is a cyclic number.

It is not a de Polignac number, because 18857880961 - 2¹⁹ = 18857356673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18857880961.

It is not a weakly prime, because it can be changed into another prime (18857880901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428940480 + 9428940481.

It is an arithmetic number, because the mean of its divisors is an integer number (9428940481).

Almost surely, 2^18857880961 is an apocalyptic number.

It is an amenable number.

18857880961 is a deficient number, since it is larger than the sum of its proper divisors (1).

18857880961 is an equidigital number, since it uses as much as digits as its factorization.

18857880961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7741440, while the sum is 61.

The spelling of 18857880961 in words is "eighteen billion, eight hundred fifty-seven million, eight hundred eighty thousand, nine hundred sixty-one".