3861957864961 has 16 divisors (see below), whose sum is σ = 4418275114368. Its totient is φ = 3306794400000.

The previous prime is 3861957864917. The next prime is 3861957864967. The reversal of 3861957864961 is 1694687591683.

It is not a de Polignac number, because 3861957864961 - 2²⁷ = 3861823647233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3861957864967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31183561 + ... + 31307161.

It is an arithmetic number, because the mean of its divisors is an integer number (276142194648).

Almost surely, 2^{3861957864961} is an apocalyptic number.

It is an amenable number.

3861957864961 is a deficient number, since it is larger than the sum of its proper divisors (556317249407).

3861957864961 is a wasteful number, since it uses less digits than its factorization.

3861957864961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128232.

The product of its digits is 470292480, while the sum is 73.

The spelling of 3861957864961 in words is "three trillion, eight hundred sixty-one billion, nine hundred fifty-seven million, eight hundred sixty-four thousand, nine hundred sixty-one".