15721350487 has 4 divisors (see below), whose sum is σ = 15746266096. Its totient is φ = 15696434880.

The previous prime is 15721350473. The next prime is 15721350503. The reversal of 15721350487 is 78405312751.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15721350487 - 2¹¹ = 15721348439 is a prime.

It is a super-2 number, since 2×15721350487² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15721350467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12456858 + ... + 12458119.

It is an arithmetic number, because the mean of its divisors is an integer number (3936566524).

Almost surely, 2^15721350487 is an apocalyptic number.

15721350487 is a deficient number, since it is larger than the sum of its proper divisors (24915609).

15721350487 is an equidigital number, since it uses as much as digits as its factorization.

15721350487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24915608.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 15721350487 in words is "fifteen billion, seven hundred twenty-one million, three hundred fifty thousand, four hundred eighty-seven".