71985426601 has 9 divisors (see below), whose sum is σ = 79127721309. Its totient is φ = 65438613900.

The previous prime is 71985426599. The next prime is 71985426607. The reversal of 71985426601 is 10662458917.

It is a happy number.

The square root of 71985426601 is 268301.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 71985426601 - 2¹ = 71985426599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71985426607) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2939116 + ... + 2963506.

Almost surely, 2^71985426601 is an apocalyptic number.

71985426601 is the 268301-st square number.

71985426601 is the 134151-st centered octagonal number.

It is an amenable number.

71985426601 is a deficient number, since it is larger than the sum of its proper divisors (7142294708).

71985426601 is an frugal number, since it uses more digits than its factorization.

71985426601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48804 (or 24402 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

Multiplying 71985426601 by its sum of digits (49), we get a square (3527285903449 = 1878107²).

The spelling of 71985426601 in words is "seventy-one billion, nine hundred eighty-five million, four hundred twenty-six thousand, six hundred one".