71607085621 has 4 divisors (see below), whose sum is σ = 74076295500. Its totient is φ = 69137875744.

The previous prime is 71607085607. The next prime is 71607085631. The reversal of 71607085621 is 12658070617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12658070617 = 19 ⋅666214243.

It can be written as a sum of positive squares in 2 ways, for example, as 15027327396 + 56579758225 = 122586^2 + 237865^2 .

It is a cyclic number.

It is not a de Polignac number, because 71607085621 - 2¹⁹ = 71606561333 is a prime.

It is a super-2 number, since 2×71607085621² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71607085631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1234604896 + ... + 1234604953.

It is an arithmetic number, because the mean of its divisors is an integer number (18519073875).

Almost surely, 2^71607085621 is an apocalyptic number.

It is an amenable number.

71607085621 is a deficient number, since it is larger than the sum of its proper divisors (2469209879).

71607085621 is a wasteful number, since it uses less digits than its factorization.

71607085621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469209878.

The product of its (nonzero) digits is 141120, while the sum is 43.

It can be divided in two parts, 7160708 and 5621, that added together give a square (7166329 = 2677²).

The spelling of 71607085621 in words is "seventy-one billion, six hundred seven million, eighty-five thousand, six hundred twenty-one".