2181325655791 has 8 divisors (see below), whose sum is σ = 2211233398784. Its totient is φ = 2151418631040.

The previous prime is 2181325655753. The next prime is 2181325655809. The reversal of 2181325655791 is 1975565231812.

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 2181325655791 - 2¹¹ = 2181325653743 is a prime.

It is a super-2 number, since 2×2181325655791² (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 (2181325655491) 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, 9454195 + ... + 9682171.

It is an arithmetic number, because the mean of its divisors is an integer number (276404174848).

Almost surely, 2^{2181325655791} is an apocalyptic number.

2181325655791 is a deficient number, since it is larger than the sum of its proper divisors (29907742993).

2181325655791 is a wasteful number, since it uses less digits than its factorization.

2181325655791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359121.

The product of its digits is 4536000, while the sum is 55.

The spelling of 2181325655791 in words is "two trillion, one hundred eighty-one billion, three hundred twenty-five million, six hundred fifty-five thousand, seven hundred ninety-one".