3897761666 has 8 divisors (see below), whose sum is σ = 6190562700. Its totient is φ = 1834240768.

The previous prime is 3897761611. The next prime is 3897761671. The reversal of 3897761666 is 6661677983.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3296482225 + 601279441 = 57415^2 + 24521^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57319991 + ... + 57320058.

Almost surely, 2^3897761666 is an apocalyptic number.

3897761666 is a deficient number, since it is larger than the sum of its proper divisors (2292801034).

3897761666 is a wasteful number, since it uses less digits than its factorization.

3897761666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114640068.

The product of its digits is 13716864, while the sum is 59.

The square root of 3897761666 is about 62432.0563973349. The cubic root of 3897761666 is about 1573.7597244671.

The spelling of 3897761666 in words is "three billion, eight hundred ninety-seven million, seven hundred sixty-one thousand, six hundred sixty-six".