15663261323 has 8 divisors (see below), whose sum is σ = 15735059760. Its totient is φ = 15591604320.

The previous prime is 15663261301. The next prime is 15663261331. The reversal of 15663261323 is 32316236651.

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 15663261323 - 2¹² = 15663257227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15663261353) 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, 189908 + ... + 259598.

It is an arithmetic number, because the mean of its divisors is an integer number (1966882470).

Almost surely, 2^15663261323 is an apocalyptic number.

15663261323 is a deficient number, since it is larger than the sum of its proper divisors (71798437).

15663261323 is an equidigital number, since it uses as much as digits as its factorization.

15663261323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70717.

The product of its digits is 116640, while the sum is 38.

Adding to 15663261323 its reverse (32316236651), we get a palindrome (47979497974).

The spelling of 15663261323 in words is "fifteen billion, six hundred sixty-three million, two hundred sixty-one thousand, three hundred twenty-three".