1869906663 has 12 divisors (see below), whose sum is σ = 2725757320. Its totient is φ = 1235167056.

The previous prime is 1869906637. The next prime is 1869906677. The reversal of 1869906663 is 3666099681.

It is not a de Polignac number, because 1869906663 - 2¹⁸ = 1869644519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1869905663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 952081 + ... + 954042.

Almost surely, 2^1869906663 is an apocalyptic number.

1869906663 is a deficient number, since it is larger than the sum of its proper divisors (855850657).

1869906663 is a wasteful number, since it uses less digits than its factorization.

1869906663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906238 (or 1906235 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 1869906663 is about 43242.4174046734. The cubic root of 1869906663 is about 1231.9884691305.

The spelling of 1869906663 in words is "one billion, eight hundred sixty-nine million, nine hundred six thousand, six hundred sixty-three".