325127216581 has 4 divisors (see below), whose sum is σ = 325291507200. Its totient is φ = 324962925964.

The previous prime is 325127216569. The next prime is 325127216593. The reversal of 325127216581 is 185612721523.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (325127216569) and next prime (325127216593).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-325127216581 is a prime.

It is a super-2 number, since 2×325127216581² (a number of 24 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 (325127216501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82142341 + ... + 82146298.

It is an arithmetic number, because the mean of its divisors is an integer number (81322876800).

Almost surely, 2^325127216581 is an apocalyptic number.

It is an amenable number.

325127216581 is a deficient number, since it is larger than the sum of its proper divisors (164290619).

325127216581 is a wasteful number, since it uses less digits than its factorization.

325127216581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164290618.

The product of its digits is 201600, while the sum is 43.

The spelling of 325127216581 in words is "three hundred twenty-five billion, one hundred twenty-seven million, two hundred sixteen thousand, five hundred eighty-one".