71633137693 has 6 divisors (see below), whose sum is σ = 77144418302. Its totient is φ = 66122005560.

The previous prime is 71633137691. The next prime is 71633137721. The reversal of 71633137693 is 39673133617.

It can be written as a sum of positive squares in only one way, i.e., 49592172249 + 22040965444 = 222693^2 + 148462^2 .

It is not a de Polignac number, because 71633137693 - 2¹ = 71633137691 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71633137691) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 927888 + ... + 1002118.

Almost surely, 2^71633137693 is an apocalyptic number.

It is an amenable number.

71633137693 is a deficient number, since it is larger than the sum of its proper divisors (5511280609).

71633137693 is an frugal number, since it uses more digits than its factorization.

71633137693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148475 (or 74244 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 49.

The spelling of 71633137693 in words is "seventy-one billion, six hundred thirty-three million, one hundred thirty-seven thousand, six hundred ninety-three".