3877661865 has 64 divisors (see below), whose sum is σ = 7748628480. Its totient is φ = 1608695040.

The previous prime is 3877661863. The next prime is 3877661867. The reversal of 3877661865 is 5681667783.

It is an interprime number because it is at equal distance from previous prime (3877661863) and next prime (3877661867).

It is not a de Polignac number, because 3877661865 - 2¹ = 3877661863 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3877661863) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 744691 + ... + 749879.

It is an arithmetic number, because the mean of its divisors is an integer number (121072320).

Almost surely, 2^3877661865 is an apocalyptic number.

3877661865 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3877661865 is a deficient number, since it is larger than the sum of its proper divisors (3870966615).

3877661865 is a wasteful number, since it uses less digits than its factorization.

3877661865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5862.

The product of its digits is 10160640, while the sum is 57.

The square root of 3877661865 is about 62270.8749336317. The cubic root of 3877661865 is about 1571.0498968299.

The spelling of 3877661865 in words is "three billion, eight hundred seventy-seven million, six hundred sixty-one thousand, eight hundred sixty-five".