71642605533 has 4 divisors (see below), whose sum is σ = 95523474048. Its totient is φ = 47761737020.

The previous prime is 71642605519. The next prime is 71642605561. The reversal of 71642605533 is 33550624617.

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 a cyclic number.

It is not a de Polignac number, because 71642605533 - 2¹⁴ = 71642589149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71642605513) 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, 11940434253 + ... + 11940434258.

It is an arithmetic number, because the mean of its divisors is an integer number (23880868512).

Almost surely, 2^71642605533 is an apocalyptic number.

It is an amenable number.

71642605533 is a deficient number, since it is larger than the sum of its proper divisors (23880868515).

71642605533 is a wasteful number, since it uses less digits than its factorization.

71642605533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23880868514.

The product of its (nonzero) digits is 453600, while the sum is 42.

The spelling of 71642605533 in words is "seventy-one billion, six hundred forty-two million, six hundred five thousand, five hundred thirty-three".