18885990677461 has 2 divisors, whose sum is σ = 18885990677462. Its totient is φ = 18885990677460.

The previous prime is 18885990677399. The next prime is 18885990677471. The reversal of 18885990677461 is 16477609958881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15698283955236 + 3187706722225 = 3962106^2 + 1785415^2 .

It is a cyclic number.

It is not a de Polignac number, because 18885990677461 - 2¹⁵ = 18885990644693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18885990677471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9442995338730 + 9442995338731.

It is an arithmetic number, because the mean of its divisors is an integer number (9442995338731).

Almost surely, 2^{18885990677461} is an apocalyptic number.

It is an amenable number.

18885990677461 is a deficient number, since it is larger than the sum of its proper divisors (1).

18885990677461 is an equidigital number, since it uses as much as digits as its factorization.

18885990677461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1463132160, while the sum is 79.

The spelling of 18885990677461 in words is "eighteen trillion, eight hundred eighty-five billion, nine hundred ninety million, six hundred seventy-seven thousand, four hundred sixty-one".