1938745665 has 16 divisors (see below), whose sum is σ = 3446659200. Its totient is φ = 1033997616.

The previous prime is 1938745663. The next prime is 1938745681. The reversal of 1938745665 is 5665478391.

1938745665 is a `hidden beast` number, since 1 + 9 + 3 + 8 + 74 + 566 + 5 = 666.

1938745665 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1938745665 - 2¹ = 1938745663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1938745663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7180405 + ... + 7180674.

It is an arithmetic number, because the mean of its divisors is an integer number (215416200).

Almost surely, 2^1938745665 is an apocalyptic number.

1938745665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1938745665 is a deficient number, since it is larger than the sum of its proper divisors (1507913535).

1938745665 is a wasteful number, since it uses less digits than its factorization.

1938745665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14361093 (or 14361087 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The square root of 1938745665 is about 44031.1896841319. The cubic root of 1938745665 is about 1246.9248494966.

The spelling of 1938745665 in words is "one billion, nine hundred thirty-eight million, seven hundred forty-five thousand, six hundred sixty-five".