3991575003946 has 32 divisors (see below), whose sum is σ = 6253694885376. Its totient is φ = 1907177910000.

The previous prime is 3991575003929. The next prime is 3991575003953. The reversal of 3991575003946 is 6493005751993.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284070621 + ... + 284084671.

It is an arithmetic number, because the mean of its divisors is an integer number (195427965168).

Almost surely, 2^{3991575003946} is an apocalyptic number.

3991575003946 is a deficient number, since it is larger than the sum of its proper divisors (2262119881430).

3991575003946 is a wasteful number, since it uses less digits than its factorization.

3991575003946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19578.

The product of its (nonzero) digits is 27556200, while the sum is 61.

The spelling of 3991575003946 in words is "three trillion, nine hundred ninety-one billion, five hundred seventy-five million, three thousand, nine hundred forty-six".