15445446457 has 6 divisors (see below), whose sum is σ = 17967152058. Its totient is φ = 13238954064.

The previous prime is 15445446451. The next prime is 15445446481. The reversal of 15445446457 is 75464454451.

It can be written as a sum of positive squares in only one way, i.e., 13849523856 + 1595922601 = 117684^2 + 39949^2 .

It is not a de Polignac number, because 15445446457 - 2³ = 15445446449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 315213193 = 15445446457 / (1 + 5 + 4 + 4 + 5 + 4 + 4 + 6 + 4 + 5 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15445446457.

It is not an unprimeable number, because it can be changed into a prime (15445446451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 157606548 + ... + 157606645.

It is an arithmetic number, because the mean of its divisors is an integer number (2994525343).

Almost surely, 2^15445446457 is an apocalyptic number.

It is an amenable number.

15445446457 is a deficient number, since it is larger than the sum of its proper divisors (2521705601).

15445446457 is an equidigital number, since it uses as much as digits as its factorization.

15445446457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315213207 (or 315213200 counting only the distinct ones).

The product of its digits is 5376000, while the sum is 49.

The spelling of 15445446457 in words is "fifteen billion, four hundred forty-five million, four hundred forty-six thousand, four hundred fifty-seven".