15721697741 has 8 divisors (see below), whose sum is σ = 15761767104. Its totient is φ = 15681662080.

The previous prime is 15721697723. The next prime is 15721697743. The reversal of 15721697741 is 14779612751.

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 15721697741 - 2¹⁴ = 15721681357 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 15721697741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15721697743) 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, 1109000 + ... + 1123086.

It is an arithmetic number, because the mean of its divisors is an integer number (1970220888).

Almost surely, 2^15721697741 is an apocalyptic number.

It is an amenable number.

15721697741 is a deficient number, since it is larger than the sum of its proper divisors (40069363).

15721697741 is a wasteful number, since it uses less digits than its factorization.

15721697741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16851.

The product of its digits is 740880, while the sum is 50.

The spelling of 15721697741 in words is "fifteen billion, seven hundred twenty-one million, six hundred ninety-seven thousand, seven hundred forty-one".