3991997049417 has 32 divisors (see below), whose sum is σ = 6375854419200. Its totient is φ = 2453969005056.

The previous prime is 3991997049407. The next prime is 3991997049479. The reversal of 3991997049417 is 7149407991993.

3991997049417 is a `hidden beast` number, since 3 + 99 + 19 + 9 + 70 + 49 + 417 = 666.

It is not a de Polignac number, because 3991997049417 - 2⁶ = 3991997049353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3991997049407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5795133 + ... + 6447290.

It is an arithmetic number, because the mean of its divisors is an integer number (199245450600).

Almost surely, 2^{3991997049417} is an apocalyptic number.

It is an amenable number.

3991997049417 is a deficient number, since it is larger than the sum of its proper divisors (2383857369783).

3991997049417 is a wasteful number, since it uses less digits than its factorization.

3991997049417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12243374 (or 12243368 counting only the distinct ones).

The product of its (nonzero) digits is 138883248, while the sum is 72.

The spelling of 3991997049417 in words is "three trillion, nine hundred ninety-one billion, nine hundred ninety-seven million, forty-nine thousand, four hundred seventeen".