71544734621 has 4 divisors (see below), whose sum is σ = 71547932544. Its totient is φ = 71541536700.

The previous prime is 71544734603. The next prime is 71544734623. The reversal of 71544734621 is 12643744517.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12643744517 = 26183 ⋅482899.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71544734621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71544734623) 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, 1565165 + ... + 1610226.

It is an arithmetic number, because the mean of its divisors is an integer number (17886983136).

Almost surely, 2^71544734621 is an apocalyptic number.

It is an amenable number.

71544734621 is a deficient number, since it is larger than the sum of its proper divisors (3197923).

71544734621 is a wasteful number, since it uses less digits than its factorization.

71544734621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197922.

The product of its digits is 564480, while the sum is 44.

The spelling of 71544734621 in words is "seventy-one billion, five hundred forty-four million, seven hundred thirty-four thousand, six hundred twenty-one".