15974532561 has 8 divisors (see below), whose sum is σ = 22937790400. Its totient is φ = 9830481552.

The previous prime is 15974532557. The next prime is 15974532583. The reversal of 15974532561 is 16523547951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15974532561 - 2² = 15974532557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15974532561.

It is not an unprimeable number, because it can be changed into a prime (15974537561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204801661 + ... + 204801738.

It is an arithmetic number, because the mean of its divisors is an integer number (2867223800).

Almost surely, 2^15974532561 is an apocalyptic number.

It is an amenable number.

15974532561 is a deficient number, since it is larger than the sum of its proper divisors (6963257839).

15974532561 is a wasteful number, since it uses less digits than its factorization.

15974532561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409603415.

The product of its digits is 1134000, while the sum is 48.

The spelling of 15974532561 in words is "fifteen billion, nine hundred seventy-four million, five hundred thirty-two thousand, five hundred sixty-one".