3960540877581 has 24 divisors (see below), whose sum is σ = 5972343663000. Its totient is φ = 2525925451392.

The previous prime is 3960540877561. The next prime is 3960540877627. The reversal of 3960540877581 is 1857780450693.

3960540877581 is a `hidden beast` number, since 3 + 9 + 6 + 0 + 5 + 40 + 8 + 7 + 7 + 581 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1641191588100 + 2319349289481 = 1281090^2 + 1522941^2 .

It is not a de Polignac number, because 3960540877581 - 2⁷ = 3960540877453 is a prime.

It is a super-2 number, since 2×3960540877581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3960540877541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69579286 + ... + 69636183.

It is an arithmetic number, because the mean of its divisors is an integer number (248847652625).

Almost surely, 2^{3960540877581} is an apocalyptic number.

It is an amenable number.

3960540877581 is a deficient number, since it is larger than the sum of its proper divisors (2011802785419).

3960540877581 is a wasteful number, since it uses less digits than its factorization.

3960540877581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139215613 (or 139215610 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 3960540877581 in words is "three trillion, nine hundred sixty billion, five hundred forty million, eight hundred seventy-seven thousand, five hundred eighty-one".