1886999489761 has 27 divisors (see below), whose sum is σ = 2007172160019. Its totient is φ = 1773762843888.

The previous prime is 1886999489747. The next prime is 1886999489801. The reversal of 1886999489761 is 1679849996881.

It is a happy number.

The square root of 1886999489761 is 1373681.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1848879270225 + 38120219536 = 1359735^2 + 195244^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1886999489761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1886999489261) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5141687800 + ... + 5141688166.

Almost surely, 2^{1886999489761} is an apocalyptic number.

1886999489761 is the 1373681-st square number.

1886999489761 is the 686841-st centered octagonal number.

It is an amenable number.

1886999489761 is a deficient number, since it is larger than the sum of its proper divisors (120172670258).

1886999489761 is an frugal number, since it uses more digits than its factorization.

1886999489761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166 (or 583 counting only the distinct ones).

The product of its digits is 3386105856, while the sum is 85.

The spelling of 1886999489761 in words is "one trillion, eight hundred eighty-six billion, nine hundred ninety-nine million, four hundred eighty-nine thousand, seven hundred sixty-one".