15540414401 has 4 divisors (see below), whose sum is σ = 15593453652. Its totient is φ = 15487375152.

The previous prime is 15540414349. The next prime is 15540414413. The reversal of 15540414401 is 10441404551.

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 14214362176 + 1326052225 = 119224^2 + 36415^2 .

It is a cyclic number.

It is not a de Polignac number, because 15540414401 - 2¹⁰ = 15540413377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15540414481) 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, 26519186 + ... + 26519771.

It is an arithmetic number, because the mean of its divisors is an integer number (3898363413).

Almost surely, 2^15540414401 is an apocalyptic number.

It is an amenable number.

15540414401 is a deficient number, since it is larger than the sum of its proper divisors (53039251).

15540414401 is an equidigital number, since it uses as much as digits as its factorization.

15540414401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53039250.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 15540414401 its reverse (10441404551), we get a palindrome (25981818952).

The spelling of 15540414401 in words is "fifteen billion, five hundred forty million, four hundred fourteen thousand, four hundred one".