3995611990656 has 512 divisors, whose sum is σ = 12916584898560. Its totient is φ = 1077774336000.

The previous prime is 3995611990609. The next prime is 3995611990673. The reversal of 3995611990656 is 6560991165993.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 498761691 + ... + 498769701.

It is an arithmetic number, because the mean of its divisors is an integer number (25227704880).

Almost surely, 2^{3995611990656} 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 3995611990656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6458292449280).

3995611990656 is an abundant number, since it is smaller than the sum of its proper divisors (8920972907904).

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

3995611990656 is a wasteful number, since it uses less digits than its factorization.

3995611990656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8376 (or 8364 counting only the distinct ones).

The product of its (nonzero) digits is 106288200, while the sum is 69.

It can be divided in two parts, 39956119 and 90656, that added together give a triangular number (40046775 = T₈₉₄₉).

The spelling of 3995611990656 in words is "three trillion, nine hundred ninety-five billion, six hundred eleven million, nine hundred ninety thousand, six hundred fifty-six".