25520323547 has 4 divisors (see below), whose sum is σ = 25593869496. Its totient is φ = 25446777600.

The previous prime is 25520323541. The next prime is 25520323561. The reversal of 25520323547 is 74532302552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25520323547 - 2⁸ = 25520323291 is a prime.

It is a super-2 number, since 2×25520323547² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25520323547.

It is not an unprimeable number, because it can be changed into a prime (25520323541) 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, 36772454 + ... + 36773147.

It is an arithmetic number, because the mean of its divisors is an integer number (6398467374).

Almost surely, 2^25520323547 is an apocalyptic number.

25520323547 is a deficient number, since it is larger than the sum of its proper divisors (73545949).

25520323547 is an equidigital number, since it uses as much as digits as its factorization.

25520323547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73545948.

The product of its (nonzero) digits is 252000, while the sum is 38.

The spelling of 25520323547 in words is "twenty-five billion, five hundred twenty million, three hundred twenty-three thousand, five hundred forty-seven".