15542020243 has 4 divisors (see below), whose sum is σ = 15584369440. Its totient is φ = 15499671048.

The previous prime is 15542020201. The next prime is 15542020267. The reversal of 15542020243 is 34202024551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15542020243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15542020343) 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, 21174048 + ... + 21174781.

It is an arithmetic number, because the mean of its divisors is an integer number (3896092360).

Almost surely, 2^15542020243 is an apocalyptic number.

15542020243 is a deficient number, since it is larger than the sum of its proper divisors (42349197).

15542020243 is an equidigital number, since it uses as much as digits as its factorization.

15542020243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42349196.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 15542020243 its reverse (34202024551), we get a palindrome (49744044794).

The spelling of 15542020243 in words is "fifteen billion, five hundred forty-two million, twenty thousand, two hundred forty-three".