15520525243 has 4 divisors (see below), whose sum is σ = 15551629000. Its totient is φ = 15489421488.

The previous prime is 15520525217. The next prime is 15520525249. The reversal of 15520525243 is 34252502551.

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 15520525243 - 2²⁹ = 14983654331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15520525199 and 15520525208.

It is not an unprimeable number, because it can be changed into a prime (15520525249) 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, 15551130 + ... + 15552127.

It is an arithmetic number, because the mean of its divisors is an integer number (3887907250).

Almost surely, 2^15520525243 is an apocalyptic number.

15520525243 is a deficient number, since it is larger than the sum of its proper divisors (31103757).

15520525243 is an equidigital number, since it uses as much as digits as its factorization.

15520525243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31103756.

The product of its (nonzero) digits is 60000, while the sum is 34.

The spelling of 15520525243 in words is "fifteen billion, five hundred twenty million, five hundred twenty-five thousand, two hundred forty-three".