15321415645 has 16 divisors (see below), whose sum is σ = 18515699712. Its totient is φ = 12170606400.

The previous prime is 15321415607. The next prime is 15321415651. The reversal of 15321415645 is 54651412351.

It is not a de Polignac number, because 15321415645 - 2²¹ = 15319318493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 929899 + ... + 946231.

It is an arithmetic number, because the mean of its divisors is an integer number (1157231232).

Almost surely, 2^15321415645 is an apocalyptic number.

It is an amenable number.

15321415645 is a deficient number, since it is larger than the sum of its proper divisors (3194284067).

15321415645 is a wasteful number, since it uses less digits than its factorization.

15321415645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17652.

The product of its digits is 72000, while the sum is 37.

Adding to 15321415645 its reverse (54651412351), we get a palindrome (69972827996).

The spelling of 15321415645 in words is "fifteen billion, three hundred twenty-one million, four hundred fifteen thousand, six hundred forty-five".