6386861945 has 4 divisors (see below), whose sum is σ = 7664234340. Its totient is φ = 5109489552.

The previous prime is 6386861941. The next prime is 6386861953. The reversal of 6386861945 is 5491686836.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4599009856 + 1787852089 = 67816^2 + 42283^2 .

It is a cyclic number.

It is not a de Polignac number, because 6386861945 - 2² = 6386861941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6386861941) 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, 638686190 + ... + 638686199.

It is an arithmetic number, because the mean of its divisors is an integer number (1916058585).

Almost surely, 2^6386861945 is an apocalyptic number.

It is an amenable number.

6386861945 is a deficient number, since it is larger than the sum of its proper divisors (1277372395).

6386861945 is a wasteful number, since it uses less digits than its factorization.

6386861945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277372394.

The product of its digits is 7464960, while the sum is 56.

The square root of 6386861945 is about 79917.8449721963. The cubic root of 6386861945 is about 1855.3642162568.

The spelling of 6386861945 in words is "six billion, three hundred eighty-six million, eight hundred sixty-one thousand, nine hundred forty-five".