3985761566 has 8 divisors (see below), whose sum is σ = 6184802520. Its totient is φ = 1924160728.

The previous prime is 3985761511. The next prime is 3985761569. The reversal of 3985761566 is 6651675893.

It is a happy number.

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

It is a super-2 number, since 2×3985761566² = 31772590522005544712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3985761569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34359956 + ... + 34360071.

It is an arithmetic number, because the mean of its divisors is an integer number (773100315).

Almost surely, 2^3985761566 is an apocalyptic number.

3985761566 is a deficient number, since it is larger than the sum of its proper divisors (2199040954).

3985761566 is a wasteful number, since it uses less digits than its factorization.

3985761566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68720058.

The product of its digits is 8164800, while the sum is 56.

The square root of 3985761566 is about 63132.8881487296. Note that the first 3 decimals coincide. The cubic root of 3985761566 is about 1585.5153039277.

The spelling of 3985761566 in words is "three billion, nine hundred eighty-five million, seven hundred sixty-one thousand, five hundred sixty-six".