71764621853 has 4 divisors (see below), whose sum is σ = 72835735680. Its totient is φ = 70693508028.

The previous prime is 71764621849. The next prime is 71764621879. The reversal of 71764621853 is 35812646717.

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: 35812646717 = 19 ⋅1884876143.

It is a cyclic number.

It is not a de Polignac number, because 71764621853 - 2² = 71764621849 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 (71764621883) 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, 535556813 + ... + 535556946.

It is an arithmetic number, because the mean of its divisors is an integer number (18208933920).

Almost surely, 2^71764621853 is an apocalyptic number.

It is an amenable number.

71764621853 is a deficient number, since it is larger than the sum of its proper divisors (1071113827).

71764621853 is a wasteful number, since it uses less digits than its factorization.

71764621853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071113826.

The product of its digits is 1693440, while the sum is 50.

The spelling of 71764621853 in words is "seventy-one billion, seven hundred sixty-four million, six hundred twenty-one thousand, eight hundred fifty-three".