71204640217 has 4 divisors (see below), whose sum is σ = 74952252880. Its totient is φ = 67457027556.

The previous prime is 71204640211. The next prime is 71204640223.

It is a happy number.

71204640217 is nontrivially palindromic in base 10.

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 an interprime number because it is at equal distance from previous prime (71204640211) and next prime (71204640223).

It is a cyclic number.

It is not a de Polignac number, because 71204640217 - 2¹⁵ = 71204607449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71204640211) 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, 1873806303 + ... + 1873806340.

It is an arithmetic number, because the mean of its divisors is an integer number (18738063220).

Almost surely, 2^71204640217 is an apocalyptic number.

It is an amenable number.

71204640217 is a deficient number, since it is larger than the sum of its proper divisors (3747612663).

71204640217 is a wasteful number, since it uses less digits than its factorization.

71204640217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3747612662.

The product of its (nonzero) digits is 18816, while the sum is 34.

The spelling of 71204640217 in words is "seventy-one billion, two hundred four million, six hundred forty thousand, two hundred seventeen".