15721470023 has 6 divisors (see below), whose sum is σ = 18288240696. Its totient is φ = 13475545692.

The previous prime is 15721469963. The next prime is 15721470041. The reversal of 15721470023 is 32007412751.

It is not a de Polignac number, because 15721470023 - 2¹⁰ = 15721468999 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 (15721470073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 160423115 + ... + 160423212.

It is an arithmetic number, because the mean of its divisors is an integer number (3048040116).

Almost surely, 2^15721470023 is an apocalyptic number.

15721470023 is a deficient number, since it is larger than the sum of its proper divisors (2566770673).

15721470023 is an equidigital number, since it uses as much as digits as its factorization.

15721470023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320846341 (or 320846334 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

Adding to 15721470023 its reverse (32007412751), we get a palindrome (47728882774).

The spelling of 15721470023 in words is "fifteen billion, seven hundred twenty-one million, four hundred seventy thousand, twenty-three".