71447280505 has 4 divisors (see below), whose sum is σ = 85736736612. Its totient is φ = 57157824400.

The previous prime is 71447280503. The next prime is 71447280511. The reversal of 71447280505 is 50508274417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50508274417 = 1447 ⋅34905511.

It can be written as a sum of positive squares in 2 ways, for example, as 45850800384 + 25596480121 = 214128^2 + 159989^2 .

It is not a de Polignac number, because 71447280505 - 2¹ = 71447280503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71447280503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7144728046 + ... + 7144728055.

It is an arithmetic number, because the mean of its divisors is an integer number (21434184153).

Almost surely, 2^71447280505 is an apocalyptic number.

It is an amenable number.

71447280505 is a deficient number, since it is larger than the sum of its proper divisors (14289456107).

71447280505 is a wasteful number, since it uses less digits than its factorization.

71447280505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14289456106.

The product of its (nonzero) digits is 313600, while the sum is 43.

The spelling of 71447280505 in words is "seventy-one billion, four hundred forty-seven million, two hundred eighty thousand, five hundred five".