32581397813 has 8 divisors (see below), whose sum is σ = 32640587928. Its totient is φ = 32522241024.

The previous prime is 32581397791. The next prime is 32581397837. The reversal of 32581397813 is 31879318523.

It can be written as a sum of positive squares in 4 ways, for example, as 7510475569 + 25070922244 = 86663^2 + 158338^2 .

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 32581397813 - 2¹⁴ = 32581381429 is a prime.

It is a super-2 number, since 2×32581397813² (a number of 22 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 (32581397213) 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, 2724395 + ... + 2736327.

It is an arithmetic number, because the mean of its divisors is an integer number (4080073491).

Almost surely, 2^32581397813 is an apocalyptic number.

It is an amenable number.

32581397813 is a deficient number, since it is larger than the sum of its proper divisors (59190115).

32581397813 is a wasteful number, since it uses less digits than its factorization.

32581397813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16663.

The product of its digits is 1088640, while the sum is 50.

The spelling of 32581397813 in words is "thirty-two billion, five hundred eighty-one million, three hundred ninety-seven thousand, eight hundred thirteen".