3949957466991 has 24 divisors (see below), whose sum is σ = 5758985266320. Its totient is φ = 2608626384000.

The previous prime is 3949957466989. The next prime is 3949957467037. The reversal of 3949957466991 is 1996647599493.

3949957466991 is a `hidden beast` number, since 39 + 4 + 9 + 9 + 574 + 6 + 6 + 9 + 9 + 1 = 666.

It is not a de Polignac number, because 3949957466991 - 2¹ = 3949957466989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3949957466991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3949957466941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4556451 + ... + 5353611.

It is an arithmetic number, because the mean of its divisors is an integer number (239957719430).

Almost surely, 2^{3949957466991} is an apocalyptic number.

3949957466991 is a deficient number, since it is larger than the sum of its proper divisors (1809027799329).

3949957466991 is a wasteful number, since it uses less digits than its factorization.

3949957466991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802327 (or 802324 counting only the distinct ones).

The product of its digits is 3571283520, while the sum is 81.

The spelling of 3949957466991 in words is "three trillion, nine hundred forty-nine billion, nine hundred fifty-seven million, four hundred sixty-six thousand, nine hundred ninety-one".