15973389561 has 16 divisors (see below), whose sum is σ = 22015549440. Its totient is φ = 10291036560.

The previous prime is 15973389539. The next prime is 15973389569. The reversal of 15973389561 is 16598337951.

It is not a de Polignac number, because 15973389561 - 2¹¹ = 15973387513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15973389569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52575 + ... + 186308.

It is an arithmetic number, because the mean of its divisors is an integer number (1375971840).

Almost surely, 2^15973389561 is an apocalyptic number.

It is an amenable number.

15973389561 is a deficient number, since it is larger than the sum of its proper divisors (6042159879).

15973389561 is a wasteful number, since it uses less digits than its factorization.

15973389561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239636.

The product of its digits is 6123600, while the sum is 57.

The spelling of 15973389561 in words is "fifteen billion, nine hundred seventy-three million, three hundred eighty-nine thousand, five hundred sixty-one".