15505434401 has 4 divisors (see below), whose sum is σ = 15507940272. Its totient is φ = 15502928532.

The previous prime is 15505434391. The next prime is 15505434421. The reversal of 15505434401 is 10443450551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10443450551 = 5417 ⋅1927903.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15505434401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15505434421) 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, 1243631 + ... + 1256036.

It is an arithmetic number, because the mean of its divisors is an integer number (3876985068).

Almost surely, 2^15505434401 is an apocalyptic number.

It is an amenable number.

15505434401 is a deficient number, since it is larger than the sum of its proper divisors (2505871).

15505434401 is an equidigital number, since it uses as much as digits as its factorization.

15505434401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505870.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 15505434401 its reverse (10443450551), we get a palindrome (25948884952).

The spelling of 15505434401 in words is "fifteen billion, five hundred five million, four hundred thirty-four thousand, four hundred one".