71550679637 has 4 divisors (see below), whose sum is σ = 71552801580. Its totient is φ = 71548557696.

The previous prime is 71550679589. The next prime is 71550679657. The reversal of 71550679637 is 73697605517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73697605517 = 19 ⋅3878821343.

It can be written as a sum of positive squares in 2 ways, for example, as 42310021636 + 29240658001 = 205694^2 + 170999^2 .

It is a cyclic number.

It is not a de Polignac number, because 71550679637 - 2¹⁴ = 71550663253 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 (71550679657) 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, 1009562 + ... + 1078107.

It is an arithmetic number, because the mean of its divisors is an integer number (17888200395).

Almost surely, 2^71550679637 is an apocalyptic number.

It is an amenable number.

71550679637 is a deficient number, since it is larger than the sum of its proper divisors (2121943).

71550679637 is a wasteful number, since it uses less digits than its factorization.

71550679637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121942.

The product of its (nonzero) digits is 8334900, while the sum is 56.

The spelling of 71550679637 in words is "seventy-one billion, five hundred fifty million, six hundred seventy-nine thousand, six hundred thirty-seven".