15305384645 has 18 divisors (see below), whose sum is σ = 18693096786. Its totient is φ = 12030302880.

The previous prime is 15305384617. The next prime is 15305384651. The reversal of 15305384645 is 54648350351.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1187905156 + 14117479489 = 34466^2 + 118817^2 .

It is not a de Polignac number, because 15305384645 - 2⁶ = 15305384581 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15305384596 and 15305384605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16874282 + ... + 16875188.

It is an arithmetic number, because the mean of its divisors is an integer number (1038505377).

Almost surely, 2^15305384645 is an apocalyptic number.

It is an amenable number.

15305384645 is a deficient number, since it is larger than the sum of its proper divisors (3387712141).

15305384645 is an frugal number, since it uses more digits than its factorization.

15305384645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 15305384645 in words is "fifteen billion, three hundred five million, three hundred eighty-four thousand, six hundred forty-five".