15445554457 has 2 divisors, whose sum is σ = 15445554458. Its totient is φ = 15445554456.

The previous prime is 15445554451. The next prime is 15445554497. The reversal of 15445554457 is 75445554451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15272263561 + 173290896 = 123581^2 + 13164^2 .

It is a cyclic number.

It is not a de Polignac number, because 15445554457 - 2⁷ = 15445554329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15445554457.

It is not a weakly prime, because it can be changed into another prime (15445554451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7722777228 + 7722777229.

It is an arithmetic number, because the mean of its divisors is an integer number (7722777229).

Almost surely, 2^15445554457 is an apocalyptic number.

It is an amenable number.

15445554457 is a deficient number, since it is larger than the sum of its proper divisors (1).

15445554457 is an equidigital number, since it uses as much as digits as its factorization.

15445554457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5600000, while the sum is 49.

The spelling of 15445554457 in words is "fifteen billion, four hundred forty-five million, five hundred fifty-four thousand, four hundred fifty-seven".