661506006589 has 8 divisors (see below), whose sum is σ = 672561957888. Its totient is φ = 650540308320.

The previous prime is 661506006587. The next prime is 661506006643. The reversal of 661506006589 is 985600605166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661506006589 - 2¹ = 661506006587 is a prime.

It is a super-2 number, since 2×661506006589² (a number of 24 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 (661506006587) 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 7 ways as a sum of consecutive naturals, for example, 22548477 + ... + 22577794.

It is an arithmetic number, because the mean of its divisors is an integer number (84070244736).

Almost surely, 2^661506006589 is an apocalyptic number.

It is an amenable number.

661506006589 is a deficient number, since it is larger than the sum of its proper divisors (11055951299).

661506006589 is a wasteful number, since it uses less digits than its factorization.

661506006589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45126515.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 661506006589 in words is "six hundred sixty-one billion, five hundred six million, six thousand, five hundred eighty-nine".