25520470591 has 16 divisors (see below), whose sum is σ = 32357018880. Its totient is φ = 19549025280.

The previous prime is 25520470561. The next prime is 25520470603. The reversal of 25520470591 is 19507402552.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25520470591 - 2¹⁹ = 25519946303 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 (25520470561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2804226 + ... + 2813311.

It is an arithmetic number, because the mean of its divisors is an integer number (2022313680).

Almost surely, 2^25520470591 is an apocalyptic number.

25520470591 is a deficient number, since it is larger than the sum of its proper divisors (6836548289).

25520470591 is a wasteful number, since it uses less digits than its factorization.

25520470591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5617614.

The product of its (nonzero) digits is 126000, while the sum is 40.

The spelling of 25520470591 in words is "twenty-five billion, five hundred twenty million, four hundred seventy thousand, five hundred ninety-one".