71255649439 has 16 divisors (see below), whose sum is σ = 76879635840. Its totient is φ = 65652202080.

The previous prime is 71255649427. The next prime is 71255649449. The reversal of 71255649439 is 93494655217.

It is a cyclic number.

It is not a de Polignac number, because 71255649439 - 2²¹ = 71253552287 is a prime.

It is a super-2 number, since 2×71255649439² (a number of 23 digits) contains 22 as substring.

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 71255649439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71255649449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21390004 + ... + 21393334.

It is an arithmetic number, because the mean of its divisors is an integer number (4804977240).

Almost surely, 2^71255649439 is an apocalyptic number.

71255649439 is a deficient number, since it is larger than the sum of its proper divisors (5623986401).

71255649439 is a wasteful number, since it uses less digits than its factorization.

71255649439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5910.

The product of its digits is 8164800, while the sum is 55.

It can be divided in two parts, 712556 and 49439, that added together give a triangular number (761995 = T₁₂₃₄).

The spelling of 71255649439 in words is "seventy-one billion, two hundred fifty-five million, six hundred forty-nine thousand, four hundred thirty-nine".