71492779581 has 4 divisors (see below), whose sum is σ = 95323706112. Its totient is φ = 47661853052.

The previous prime is 71492779573. The next prime is 71492779609. The reversal of 71492779581 is 18597729417.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71492779581 - 2³ = 71492779573 is a prime.

It is a super-2 number, since 2×71492779581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71492779381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11915463261 + ... + 11915463266.

It is an arithmetic number, because the mean of its divisors is an integer number (23830926528).

Almost surely, 2^71492779581 is an apocalyptic number.

It is an amenable number.

71492779581 is a deficient number, since it is larger than the sum of its proper divisors (23830926531).

71492779581 is a wasteful number, since it uses less digits than its factorization.

71492779581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23830926530.

The product of its digits is 8890560, while the sum is 60.

The spelling of 71492779581 in words is "seventy-one billion, four hundred ninety-two million, seven hundred seventy-nine thousand, five hundred eighty-one".