3991996526832 has 160 divisors (see below), whose sum is σ = 12008027865600. Its totient is φ = 1267347045888.

The previous prime is 3991996526831. The next prime is 3991996526863. The reversal of 3991996526832 is 2386256991993.

3991996526832 is a `hidden beast` number, since 3 + 9 + 9 + 1 + 9 + 96 + 526 + 8 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991996526831) 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, 1452919 + ... + 3177257.

It is an arithmetic number, because the mean of its divisors is an integer number (75050174160).

Almost surely, 2^{3991996526832} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3991996526832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6004013932800).

3991996526832 is an abundant number, since it is smaller than the sum of its proper divisors (8016031338768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3991996526832 is a wasteful number, since it uses less digits than its factorization.

3991996526832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724612 (or 1724600 counting only the distinct ones).

The product of its digits is 340122240, while the sum is 72.

The spelling of 3991996526832 in words is "three trillion, nine hundred ninety-one billion, nine hundred ninety-six million, five hundred twenty-six thousand, eight hundred thirty-two".