71726834261 has 4 divisors (see below), whose sum is σ = 71727950112. Its totient is φ = 71725718412.

The previous prime is 71726834191. The next prime is 71726834273. The reversal of 71726834261 is 16243862717.

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 a de Polignac number, because none of the positive numbers 2^k-71726834261 is a prime.

It is a super-2 number, since 2×71726834261² (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 (71726834461) 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, 455201 + ... + 592166.

It is an arithmetic number, because the mean of its divisors is an integer number (17931987528).

Almost surely, 2^71726834261 is an apocalyptic number.

It is an amenable number.

71726834261 is a deficient number, since it is larger than the sum of its proper divisors (1115851).

71726834261 is a wasteful number, since it uses less digits than its factorization.

71726834261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115850.

The product of its digits is 677376, while the sum is 47.

The spelling of 71726834261 in words is "seventy-one billion, seven hundred twenty-six million, eight hundred thirty-four thousand, two hundred sixty-one".