3991996645901 has 8 divisors (see below), whose sum is σ = 4354922587104. Its totient is φ = 3629073563920.

The previous prime is 3991996645877. The next prime is 3991996645907. The reversal of 3991996645901 is 1095466991993.

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

It is a cyclic number.

It is not a de Polignac number, because 3991996645901 - 2³⁰ = 3990922904077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991996645907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3080810 + ... + 4180356.

It is an arithmetic number, because the mean of its divisors is an integer number (544365323388).

Almost surely, 2^{3991996645901} is an apocalyptic number.

It is an amenable number.

3991996645901 is a deficient number, since it is larger than the sum of its proper divisors (362925941203).

3991996645901 is a wasteful number, since it uses less digits than its factorization.

3991996645901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429611.

The product of its (nonzero) digits is 127545840, while the sum is 71.

The spelling of 3991996645901 in words is "three trillion, nine hundred ninety-one billion, nine hundred ninety-six million, six hundred forty-five thousand, nine hundred one".