71654398321 has 4 divisors (see below), whose sum is σ = 78168434544. Its totient is φ = 65140362100.

The previous prime is 71654398303. The next prime is 71654398331. The reversal of 71654398321 is 12389345617.

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: 12389345617 = 11 ⋅1126304147.

It is not a de Polignac number, because 71654398321 - 2²¹ = 71652301169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71654398331) 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, 3257018095 + ... + 3257018116.

It is an arithmetic number, because the mean of its divisors is an integer number (19542108636).

Almost surely, 2^71654398321 is an apocalyptic number.

It is an amenable number.

71654398321 is a deficient number, since it is larger than the sum of its proper divisors (6514036223).

71654398321 is a wasteful number, since it uses less digits than its factorization.

71654398321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6514036222.

The product of its digits is 1088640, while the sum is 49.

The spelling of 71654398321 in words is "seventy-one billion, six hundred fifty-four million, three hundred ninety-eight thousand, three hundred twenty-one".