3991573974735 has 24 divisors (see below), whose sum is σ = 6918790179600. Its totient is φ = 2128820389632.

The previous prime is 3991573974721. The next prime is 3991573974737. The reversal of 3991573974735 is 5374793751993.

3991573974735 is a `hidden beast` number, since 3 + 9 + 9 + 1 + 573 + 9 + 7 + 47 + 3 + 5 = 666.

It is not a de Polignac number, because 3991573974735 - 2³³ = 3982984040143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991573974737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5718816 + ... + 6378714.

It is an arithmetic number, because the mean of its divisors is an integer number (288282924150).

Almost surely, 2^{3991573974735} is an apocalyptic number.

3991573974735 is a deficient number, since it is larger than the sum of its proper divisors (2927216204865).

3991573974735 is a wasteful number, since it uses less digits than its factorization.

3991573974735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794327 (or 794324 counting only the distinct ones).

The product of its digits is 675126900, while the sum is 72.

The spelling of 3991573974735 in words is "three trillion, nine hundred ninety-one billion, five hundred seventy-three million, nine hundred seventy-four thousand, seven hundred thirty-five".