71272516381 has 6 divisors (see below), whose sum is σ = 78340865246. Its totient is φ = 64793196600.

The previous prime is 71272516321. The next prime is 71272516397. The reversal of 71272516381 is 18361527217.

It can be written as a sum of positive squares in only one way, i.e., 69516068281 + 1756448100 = 263659^2 + 41910^2 .

It is not a de Polignac number, because 71272516381 - 2⁷ = 71272516253 is a prime.

It is a super-2 number, since 2×71272516381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71272516321) 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, 294514410 + ... + 294514651.

Almost surely, 2^71272516381 is an apocalyptic number.

It is an amenable number.

71272516381 is a deficient number, since it is larger than the sum of its proper divisors (7068348865).

71272516381 is a wasteful number, since it uses less digits than its factorization.

71272516381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589029083 (or 589029072 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The spelling of 71272516381 in words is "seventy-one billion, two hundred seventy-two million, five hundred sixteen thousand, three hundred eighty-one".