2163347331581 has 8 divisors (see below), whose sum is σ = 2198180346624. Its totient is φ = 2128589147520.

The previous prime is 2163347331547. The next prime is 2163347331589. The reversal of 2163347331581 is 1851337433612.

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 2163347331581 - 2⁶ = 2163347331517 is a prime.

It is a super-2 number, since 2×2163347331581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2163347331589) 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, 18649460 + ... + 18765101.

It is an arithmetic number, because the mean of its divisors is an integer number (274772543328).

Almost surely, 2^{2163347331581} is an apocalyptic number.

It is an amenable number.

2163347331581 is a deficient number, since it is larger than the sum of its proper divisors (34833015043).

2163347331581 is an equidigital number, since it uses as much as digits as its factorization.

2163347331581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37415491.

The product of its digits is 1088640, while the sum is 47.

The spelling of 2163347331581 in words is "two trillion, one hundred sixty-three billion, three hundred forty-seven million, three hundred thirty-one thousand, five hundred eighty-one".