13723391561 has 8 divisors (see below), whose sum is σ = 15151346784. Its totient is φ = 12325498720.

The previous prime is 13723391557. The next prime is 13723391567. The reversal of 13723391561 is 16519332731.

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 13723391561 - 2² = 13723391557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13723391567) 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, 7514636 + ... + 7516461.

It is an arithmetic number, because the mean of its divisors is an integer number (1893918348).

Almost surely, 2^13723391561 is an apocalyptic number.

13723391561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13723391561 is a deficient number, since it is larger than the sum of its proper divisors (1427955223).

13723391561 is a wasteful number, since it uses less digits than its factorization.

13723391561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15031191.

The product of its digits is 102060, while the sum is 41.

It can be divided in two parts, 1372 and 3391561, that added together give a palindrome (3392933).

The spelling of 13723391561 in words is "thirteen billion, seven hundred twenty-three million, three hundred ninety-one thousand, five hundred sixty-one".