15721350473 has 2 divisors, whose sum is σ = 15721350474. Its totient is φ = 15721350472.

The previous prime is 15721350467. The next prime is 15721350503. The reversal of 15721350473 is 37405312751.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15088928569 + 632421904 = 122837^2 + 25148^2 .

It is an emirp because it is prime and its reverse (37405312751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15721350473 - 2¹⁴ = 15721334089 is a prime.

It is not a weakly prime, because it can be changed into another prime (15721350433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7860675236 + 7860675237.

It is an arithmetic number, because the mean of its divisors is an integer number (7860675237).

Almost surely, 2^15721350473 is an apocalyptic number.

It is an amenable number.

15721350473 is a deficient number, since it is larger than the sum of its proper divisors (1).

15721350473 is an equidigital number, since it uses as much as digits as its factorization.

15721350473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88200, while the sum is 38.

The spelling of 15721350473 in words is "fifteen billion, seven hundred twenty-one million, three hundred fifty thousand, four hundred seventy-three".