15504320201 has 4 divisors (see below), whose sum is σ = 15583022532. Its totient is φ = 15425617872.

The previous prime is 15504320189. The next prime is 15504320267. The reversal of 15504320201 is 10202340551.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11430817225 + 4073502976 = 106915^2 + 63824^2 .

It is a cyclic number.

It is not a de Polignac number, because 15504320201 - 2⁶ = 15504320137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15504320291) 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, 39350870 + ... + 39351263.

It is an arithmetic number, because the mean of its divisors is an integer number (3895755633).

Almost surely, 2^15504320201 is an apocalyptic number.

It is an amenable number.

15504320201 is a deficient number, since it is larger than the sum of its proper divisors (78702331).

15504320201 is an equidigital number, since it uses as much as digits as its factorization.

15504320201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78702330.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 15504320201 its reverse (10202340551), we get a palindrome (25706660752).

The spelling of 15504320201 in words is "fifteen billion, five hundred four million, three hundred twenty thousand, two hundred one".