71989000669 has 4 divisors (see below), whose sum is σ = 72057497440. Its totient is φ = 71920503900.

The previous prime is 71989000639. The next prime is 71989000697. The reversal of 71989000669 is 96600098917.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71989000669 - 2¹⁹ = 71988476381 is a prime.

It is a super-2 number, since 2×71989000669² (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 (71989000639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34246809 + ... + 34248910.

It is an arithmetic number, because the mean of its divisors is an integer number (18014374360).

Almost surely, 2^71989000669 is an apocalyptic number.

71989000669 is the 154908-th hex number.

It is an amenable number.

71989000669 is a deficient number, since it is larger than the sum of its proper divisors (68496771).

71989000669 is a wasteful number, since it uses less digits than its factorization.

71989000669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68496770.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 71989000669 in words is "seventy-one billion, nine hundred eighty-nine million, six hundred sixty-nine", and thus it is an aban number.