1868191712409 has 24 divisors (see below), whose sum is σ = 2757941051040. Its totient is φ = 1123972864960.

The previous prime is 1868191712383. The next prime is 1868191712479. The reversal of 1868191712409 is 9042171918681.

It is not a de Polignac number, because 1868191712409 - 2¹⁶ = 1868191646873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1868191712479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18733239 + ... + 18832700.

It is an arithmetic number, because the mean of its divisors is an integer number (114914210460).

Almost surely, 2^{1868191712409} is an apocalyptic number.

It is an amenable number.

1868191712409 is a deficient number, since it is larger than the sum of its proper divisors (889749338631).

1868191712409 is a wasteful number, since it uses less digits than its factorization.

1868191712409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37566101 (or 37566090 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 57.

The spelling of 1868191712409 in words is "one trillion, eight hundred sixty-eight billion, one hundred ninety-one million, seven hundred twelve thousand, four hundred nine".