3857966643 has 4 divisors (see below), whose sum is σ = 5143955528. Its totient is φ = 2571977760.

The previous prime is 3857966611. The next prime is 3857966719. The reversal of 3857966643 is 3466697583.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3857966643 - 2⁵ = 3857966611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3857966603) 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, 642994438 + ... + 642994443.

It is an arithmetic number, because the mean of its divisors is an integer number (1285988882).

Almost surely, 2^3857966643 is an apocalyptic number.

3857966643 is a deficient number, since it is larger than the sum of its proper divisors (1285988885).

3857966643 is a wasteful number, since it uses less digits than its factorization.

3857966643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285988884.

The product of its digits is 19595520, while the sum is 57.

The square root of 3857966643 is about 62112.5320929682. The cubic root of 3857966643 is about 1568.3855153431.

The spelling of 3857966643 in words is "three billion, eight hundred fifty-seven million, nine hundred sixty-six thousand, six hundred forty-three".