15540074449 has 2 divisors, whose sum is σ = 15540074450. Its totient is φ = 15540074448.

The previous prime is 15540074447. The next prime is 15540074461. The reversal of 15540074449 is 94447004551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9569730625 + 5970343824 = 97825^2 + 77268^2 .

It is a cyclic number.

It is not a de Polignac number, because 15540074449 - 2¹ = 15540074447 is a prime.

Together with 15540074447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15540074447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7770037224 + 7770037225.

It is an arithmetic number, because the mean of its divisors is an integer number (7770037225).

Almost surely, 2^15540074449 is an apocalyptic number.

It is an amenable number.

15540074449 is a deficient number, since it is larger than the sum of its proper divisors (1).

15540074449 is an equidigital number, since it uses as much as digits as its factorization.

15540074449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 15540074449 in words is "fifteen billion, five hundred forty million, seventy-four thousand, four hundred forty-nine".