15456220447 has 2 divisors, whose sum is σ = 15456220448. Its totient is φ = 15456220446.

The previous prime is 15456220397. The next prime is 15456220459. The reversal of 15456220447 is 74402265451.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15456220447 - 2¹¹ = 15456218399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15456220477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7728110223 + 7728110224.

It is an arithmetic number, because the mean of its divisors is an integer number (7728110224).

Almost surely, 2^15456220447 is an apocalyptic number.

15456220447 is a deficient number, since it is larger than the sum of its proper divisors (1).

15456220447 is an equidigital number, since it uses as much as digits as its factorization.

15456220447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 268800, while the sum is 40.

Adding to 15456220447 its reverse (74402265451), we get a palindrome (89858485898).

The spelling of 15456220447 in words is "fifteen billion, four hundred fifty-six million, two hundred twenty thousand, four hundred forty-seven".