15663435243 has 4 divisors (see below), whose sum is σ = 20884580328. Its totient is φ = 10442290160.

The previous prime is 15663435211. The next prime is 15663435343. The reversal of 15663435243 is 34253436651.

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 15663435243 - 2⁵ = 15663435211 is a prime.

It is a super-2 number, since 2×15663435243² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15663435195 and 15663435204.

It is not an unprimeable number, because it can be changed into a prime (15663435143) 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, 2610572538 + ... + 2610572543.

It is an arithmetic number, because the mean of its divisors is an integer number (5221145082).

Almost surely, 2^15663435243 is an apocalyptic number.

15663435243 is a deficient number, since it is larger than the sum of its proper divisors (5221145085).

15663435243 is an equidigital number, since it uses as much as digits as its factorization.

15663435243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221145084.

The product of its digits is 777600, while the sum is 42.

The spelling of 15663435243 in words is "fifteen billion, six hundred sixty-three million, four hundred thirty-five thousand, two hundred forty-three".