15540225443 has 2 divisors, whose sum is σ = 15540225444. Its totient is φ = 15540225442.

The previous prime is 15540225439. The next prime is 15540225529. The reversal of 15540225443 is 34452204551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15540225443 - 2² = 15540225439 is a prime.

It is not a weakly prime, because it can be changed into another prime (15540225433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7770112721 + 7770112722.

It is an arithmetic number, because the mean of its divisors is an integer number (7770112722).

Almost surely, 2^15540225443 is an apocalyptic number.

15540225443 is a deficient number, since it is larger than the sum of its proper divisors (1).

15540225443 is an equidigital number, since it uses as much as digits as its factorization.

15540225443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 15540225443 its reverse (34452204551), we get a palindrome (49992429994).

The spelling of 15540225443 in words is "fifteen billion, five hundred forty million, two hundred twenty-five thousand, four hundred forty-three".