71654188489 has 27 divisors (see below), whose sum is σ = 79154214453. Its totient is φ = 64834964064.

The previous prime is 71654188483. The next prime is 71654188583. The reversal of 71654188489 is 98488145617.

The square root of 71654188489 is 267683.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1539385225 + 70114803264 = 39235^2 + 264792^2 .

It is a de Polignac number, because none of the positive numbers 2^k-71654188489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71654188483) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 205312687 + ... + 205313035.

Almost surely, 2^71654188489 is an apocalyptic number.

71654188489 is the 267683-rd square number.

71654188489 is the 133842-nd centered octagonal number.

It is an amenable number.

71654188489 is a deficient number, since it is larger than the sum of its proper divisors (7500025964).

71654188489 is an frugal number, since it uses more digits than its factorization.

71654188489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842 (or 421 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 61.

The spelling of 71654188489 in words is "seventy-one billion, six hundred fifty-four million, one hundred eighty-eight thousand, four hundred eighty-nine".