3991523058061 has 8 divisors (see below), whose sum is σ = 4976444332224. Its totient is φ = 3110277707520.

The previous prime is 3991523058041. The next prime is 3991523058121. The reversal of 3991523058061 is 1608503251993.

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 3991523058061 - 2²⁵ = 3991489503629 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 (3991523058041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25918980820 + ... + 25918980973.

It is an arithmetic number, because the mean of its divisors is an integer number (622055541528).

Almost surely, 2^{3991523058061} is an apocalyptic number.

It is an amenable number.

3991523058061 is a deficient number, since it is larger than the sum of its proper divisors (984921274163).

3991523058061 is a wasteful number, since it uses less digits than its factorization.

3991523058061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51837961811.

The product of its (nonzero) digits is 1749600, while the sum is 52.

The spelling of 3991523058061 in words is "three trillion, nine hundred ninety-one billion, five hundred twenty-three million, fifty-eight thousand, sixty-one".