16389792561 has 8 divisors (see below), whose sum is σ = 21859484544. Its totient is φ = 10923314480.

The previous prime is 16389792553. The next prime is 16389792563. The reversal of 16389792561 is 16529798361.

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

It is a cyclic number.

It is not a de Polignac number, because 16389792561 - 2³ = 16389792553 is a prime.

It is a super-2 number, since 2×16389792561² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16389792563) 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, 791550 + ... + 811991.

It is an arithmetic number, because the mean of its divisors is an integer number (2732435568).

Almost surely, 2^16389792561 is an apocalyptic number.

It is an amenable number.

16389792561 is a deficient number, since it is larger than the sum of its proper divisors (5469691983).

16389792561 is a wasteful number, since it uses less digits than its factorization.

16389792561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606951.

The product of its digits is 4898880, while the sum is 57.

The spelling of 16389792561 in words is "sixteen billion, three hundred eighty-nine million, seven hundred ninety-two thousand, five hundred sixty-one".