325832991661 has 4 divisors (see below), whose sum is σ = 331355584800. Its totient is φ = 320310398524.

The previous prime is 325832991643. The next prime is 325832991689. The reversal of 325832991661 is 166199238523.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166199238523 = 73327 ⋅2266549.

It is a cyclic number.

It is not a de Polignac number, because 325832991661 - 2¹¹ = 325832989613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (325832991691) 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, 2761296481 + ... + 2761296598.

It is an arithmetic number, because the mean of its divisors is an integer number (82838896200).

Almost surely, 2^325832991661 is an apocalyptic number.

It is an amenable number.

325832991661 is a deficient number, since it is larger than the sum of its proper divisors (5522593139).

325832991661 is an equidigital number, since it uses as much as digits as its factorization.

325832991661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5522593138.

The product of its digits is 4199040, while the sum is 55.

The spelling of 325832991661 in words is "three hundred twenty-five billion, eight hundred thirty-two million, nine hundred ninety-one thousand, six hundred sixty-one".