25661572323 has 8 divisors (see below), whose sum is σ = 34231494336. Its totient is φ = 17099682600.

The previous prime is 25661572271. The next prime is 25661572327. The reversal of 25661572323 is 32327516652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25661572323 - 2⁸ = 25661572067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25661572327) 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, 2000613 + ... + 2013398.

It is an arithmetic number, because the mean of its divisors is an integer number (4278936792).

Almost surely, 2^25661572323 is an apocalyptic number.

25661572323 is a deficient number, since it is larger than the sum of its proper divisors (8569922013).

25661572323 is a wasteful number, since it uses less digits than its factorization.

25661572323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016145.

The product of its digits is 453600, while the sum is 42.

The spelling of 25661572323 in words is "twenty-five billion, six hundred sixty-one million, five hundred seventy-two thousand, three hundred twenty-three".