71538633381 has 8 divisors (see below), whose sum is σ = 98461775104. Its totient is φ = 46153956960.

The previous prime is 71538633379. The next prime is 71538633403. The reversal of 71538633381 is 18333683517.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71538633381 - 2¹ = 71538633379 is a prime.

It is a super-2 number, since 2×71538633381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71538633381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71538633371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 384616216 + ... + 384616401.

It is an arithmetic number, because the mean of its divisors is an integer number (12307721888).

Almost surely, 2^71538633381 is an apocalyptic number.

It is an amenable number.

71538633381 is a deficient number, since it is larger than the sum of its proper divisors (26923141723).

71538633381 is a wasteful number, since it uses less digits than its factorization.

71538633381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769232651.

The product of its digits is 1088640, while the sum is 48.

The spelling of 71538633381 in words is "seventy-one billion, five hundred thirty-eight million, six hundred thirty-three thousand, three hundred eighty-one".