3890981566 has 8 divisors (see below), whose sum is σ = 5902050960. Its totient is φ = 1923631248.

The previous prime is 3890981543. The next prime is 3890981587. The reversal of 3890981566 is 6651890983.

It is a happy number.

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

It is a congruent number.

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, 10929546 + ... + 10929901.

It is an arithmetic number, because the mean of its divisors is an integer number (737756370).

Almost surely, 2^3890981566 is an apocalyptic number.

3890981566 is a deficient number, since it is larger than the sum of its proper divisors (2011069394).

3890981566 is a wasteful number, since it uses less digits than its factorization.

3890981566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21859538.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 3890981566 is about 62377.7329341168. The cubic root of 3890981566 is about 1572.8466841017.

The spelling of 3890981566 in words is "three billion, eight hundred ninety million, nine hundred eighty-one thousand, five hundred sixty-six".