15478478649571 has 6 divisors (see below), whose sum is σ = 18005577204660. Its totient is φ = 13267267413876.

The previous prime is 15478478649533. The next prime is 15478478649643. The reversal of 15478478649571 is 17594687487451.

It is not a de Polignac number, because 15478478649571 - 2¹⁹ = 15478478125283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15478478649371) 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, 157943659641 + ... + 157943659738.

It is an arithmetic number, because the mean of its divisors is an integer number (3000929534110).

Almost surely, 2^{15478478649571} is an apocalyptic number.

15478478649571 is a deficient number, since it is larger than the sum of its proper divisors (2527098555089).

15478478649571 is an equidigital number, since it uses as much as digits as its factorization.

15478478649571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315887319393 (or 315887319386 counting only the distinct ones).

The product of its digits is 1896652800, while the sum is 76.

The spelling of 15478478649571 in words is "fifteen trillion, four hundred seventy-eight billion, four hundred seventy-eight million, six hundred forty-nine thousand, five hundred seventy-one".