3765666987 has 6 divisors (see below), whose sum is σ = 5439296772. Its totient is φ = 2510444652.

The previous prime is 3765666929. The next prime is 3765667021. The reversal of 3765666987 is 7896665673.

It is not a de Polignac number, because 3765666987 - 2⁷ = 3765666859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3765666887) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 209203713 + ... + 209203730.

It is an arithmetic number, because the mean of its divisors is an integer number (906549462).

Almost surely, 2^3765666987 is an apocalyptic number.

3765666987 is a deficient number, since it is larger than the sum of its proper divisors (1673629785).

3765666987 is a wasteful number, since it uses less digits than its factorization.

3765666987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418407449 (or 418407446 counting only the distinct ones).

The product of its digits is 68584320, while the sum is 63.

The square root of 3765666987 is about 61365.0306526445. The cubic root of 3765666987 is about 1555.7768456012.

The spelling of 3765666987 in words is "three billion, seven hundred sixty-five million, six hundred sixty-six thousand, nine hundred eighty-seven".