3991538484170 has 8 divisors (see below), whose sum is σ = 7184769271524. Its totient is φ = 1596615393664.

The previous prime is 3991538484133. The next prime is 3991538484221. The reversal of 3991538484170 is 714848351993.

It can be written as a sum of positive squares in 2 ways, for example, as 3598734203089 + 392804281081 = 1897033^2 + 626741^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×3991538484170² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199576924199 + ... + 199576924218.

Almost surely, 2^{3991538484170} is an apocalyptic number.

3991538484170 is a deficient number, since it is larger than the sum of its proper divisors (3193230787354).

3991538484170 is a wasteful number, since it uses less digits than its factorization.

3991538484170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399153848424.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 3991538484170 in words is "three trillion, nine hundred ninety-one billion, five hundred thirty-eight million, four hundred eighty-four thousand, one hundred seventy".