15621105545 has 16 divisors (see below), whose sum is σ = 18794846208. Its totient is φ = 12463917120.

The previous prime is 15621105497. The next prime is 15621105547. The reversal of 15621105545 is 54550112651.

15621105545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15621105545 - 2⁶ = 15621105481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15621105547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4189472 + ... + 4193198.

It is an arithmetic number, because the mean of its divisors is an integer number (1174677888).

Almost surely, 2^15621105545 is an apocalyptic number.

It is an amenable number.

15621105545 is a deficient number, since it is larger than the sum of its proper divisors (3173740663).

15621105545 is a wasteful number, since it uses less digits than its factorization.

15621105545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5720.

The product of its (nonzero) digits is 30000, while the sum is 35.

The spelling of 15621105545 in words is "fifteen billion, six hundred twenty-one million, one hundred five thousand, five hundred forty-five".