15660231523 has 4 divisors (see below), whose sum is σ = 15660897408. Its totient is φ = 15659565640.

The previous prime is 15660231427. The next prime is 15660231553. The reversal of 15660231523 is 32513206651.

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 15660231523 - 2⁹ = 15660231011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15660231553) 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, 296323 + ... + 345148.

It is an arithmetic number, because the mean of its divisors is an integer number (3915224352).

Almost surely, 2^15660231523 is an apocalyptic number.

15660231523 is a deficient number, since it is larger than the sum of its proper divisors (665885).

15660231523 is an equidigital number, since it uses as much as digits as its factorization.

15660231523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665884.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 15660231523 in words is "fifteen billion, six hundred sixty million, two hundred thirty-one thousand, five hundred twenty-three".