15721061912191 has 8 divisors (see below), whose sum is σ = 16323625375200. Its totient is φ = 15122528974560.

The previous prime is 15721061912177. The next prime is 15721061912207. The reversal of 15721061912191 is 19121916012751.

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 15721061912191 - 2⁵ = 15721061912159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15721061912111) 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, 1007623395 + ... + 1007638996.

It is an arithmetic number, because the mean of its divisors is an integer number (2040453171900).

Almost surely, 2^{15721061912191} is an apocalyptic number.

15721061912191 is a deficient number, since it is larger than the sum of its proper divisors (602563463009).

15721061912191 is a wasteful number, since it uses less digits than its factorization.

15721061912191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015262689.

The product of its (nonzero) digits is 68040, while the sum is 46.

The spelling of 15721061912191 in words is "fifteen trillion, seven hundred twenty-one billion, sixty-one million, nine hundred twelve thousand, one hundred ninety-one".