15505232565 has 16 divisors (see below), whose sum is σ = 24815044800. Its totient is φ = 8267233152.

The previous prime is 15505232563. The next prime is 15505232599. The reversal of 15505232565 is 56523250551.

It is not a de Polignac number, because 15505232565 - 2¹ = 15505232563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15505232563) 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, 80595 + ... + 193664.

It is an arithmetic number, because the mean of its divisors is an integer number (1550940300).

Almost surely, 2^15505232565 is an apocalyptic number.

15505232565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15505232565 is a deficient number, since it is larger than the sum of its proper divisors (9309812235).

15505232565 is a wasteful number, since it uses less digits than its factorization.

15505232565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278036.

The product of its (nonzero) digits is 225000, while the sum is 39.

The spelling of 15505232565 in words is "fifteen billion, five hundred five million, two hundred thirty-two thousand, five hundred sixty-five".