325524931661 has 4 divisors (see below), whose sum is σ = 327211589532. Its totient is φ = 323838273792.

The previous prime is 325524931619. The next prime is 325524931727. The reversal of 325524931661 is 166139425523.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166139425523 = 769 ⋅216046067.

It can be written as a sum of positive squares in 2 ways, for example, as 123056430436 + 202468501225 = 350794^2 + 449965^2 .

It is a cyclic number.

It is not a de Polignac number, because 325524931661 - 2¹⁴ = 325524915277 is a prime.

It is a super-2 number, since 2×325524931661² (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 (325524931601) 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, 843328646 + ... + 843329031.

It is an arithmetic number, because the mean of its divisors is an integer number (81802897383).

Almost surely, 2^325524931661 is an apocalyptic number.

It is an amenable number.

325524931661 is a deficient number, since it is larger than the sum of its proper divisors (1686657871).

325524931661 is a wasteful number, since it uses less digits than its factorization.

325524931661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686657870.

The product of its digits is 1166400, while the sum is 47.

The spelling of 325524931661 in words is "three hundred twenty-five billion, five hundred twenty-four million, nine hundred thirty-one thousand, six hundred sixty-one".