71550578217 has 4 divisors (see below), whose sum is σ = 95400770960. Its totient is φ = 47700385476.

The previous prime is 71550578171. The next prime is 71550578249. The reversal of 71550578217 is 71287505517.

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 not a de Polignac number, because 71550578217 - 2¹¹ = 71550576169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71550578257) 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, 11925096367 + ... + 11925096372.

It is an arithmetic number, because the mean of its divisors is an integer number (23850192740).

Almost surely, 2^71550578217 is an apocalyptic number.

It is an amenable number.

71550578217 is a deficient number, since it is larger than the sum of its proper divisors (23850192743).

71550578217 is a wasteful number, since it uses less digits than its factorization.

71550578217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23850192742.

The product of its (nonzero) digits is 686000, while the sum is 48.

The spelling of 71550578217 in words is "seventy-one billion, five hundred fifty million, five hundred seventy-eight thousand, two hundred seventeen".