3981468771945 has 24 divisors (see below), whose sum is σ = 7887100044096. Its totient is φ = 1820100009888.

The previous prime is 3981468771941. The next prime is 3981468771949. The reversal of 3981468771945 is 5491778641893.

3981468771945 is a `hidden beast` number, since 3 + 9 + 8 + 1 + 468 + 7 + 71 + 94 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (3981468771941) and next prime (3981468771949).

It is not a de Polignac number, because 3981468771945 - 2² = 3981468771941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3981468771941) 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 23 ways as a sum of consecutive naturals, for example, 6319791387 + ... + 6319792016.

It is an arithmetic number, because the mean of its divisors is an integer number (328629168504).

Almost surely, 2^{3981468771945} is an apocalyptic number.

3981468771945 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3981468771945 is a deficient number, since it is larger than the sum of its proper divisors (3905631272151).

3981468771945 is a wasteful number, since it uses less digits than its factorization.

3981468771945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12639583421 (or 12639583418 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 72.

The spelling of 3981468771945 in words is "three trillion, nine hundred eighty-one billion, four hundred sixty-eight million, seven hundred seventy-one thousand, nine hundred forty-five".