3966918781 has 32 divisors (see below), whose sum is σ = 4860661760. Its totient is φ = 3161923776.

The previous prime is 3966918773. The next prime is 3966918799. The reversal of 3966918781 is 1878196693.

It is a cyclic number.

It is not a de Polignac number, because 3966918781 - 2³ = 3966918773 is a prime.

It is a super-2 number, since 2×3966918781² = 31472889230101051922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966918701) 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 31 ways as a sum of consecutive naturals, for example, 3269731 + ... + 3270943.

It is an arithmetic number, because the mean of its divisors is an integer number (151895680).

Almost surely, 2^3966918781 is an apocalyptic number.

It is an amenable number.

3966918781 is a deficient number, since it is larger than the sum of its proper divisors (893742979).

3966918781 is a wasteful number, since it uses less digits than its factorization.

3966918781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673.

The product of its digits is 3919104, while the sum is 58.

The square root of 3966918781 is about 62983.4802229918. The cubic root of 3966918781 is about 1583.0128355270.

The spelling of 3966918781 in words is "three billion, nine hundred sixty-six million, nine hundred eighteen thousand, seven hundred eighty-one".