71242533765 has 24 divisors (see below), whose sum is σ = 132986064120. Its totient is φ = 35073247104.

The previous prime is 71242533731. The next prime is 71242533797. The reversal of 71242533765 is 56733524217.

71242533765 is a `hidden beast` number, since 7 + 1 + 2 + 42 + 533 + 76 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11687988321 + 59554545444 = 108111^2 + 244038^2 .

It is not a de Polignac number, because 71242533765 - 2⁹ = 71242533253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 71242533765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60890470 + ... + 60891639.

It is an arithmetic number, because the mean of its divisors is an integer number (5541086005).

Almost surely, 2^71242533765 is an apocalyptic number.

It is an amenable number.

71242533765 is a deficient number, since it is larger than the sum of its proper divisors (61743530355).

71242533765 is a wasteful number, since it uses less digits than its factorization.

71242533765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121782133 (or 121782130 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 45.

The spelling of 71242533765 in words is "seventy-one billion, two hundred forty-two million, five hundred thirty-three thousand, seven hundred sixty-five".