661506006588 has 24 divisors (see below), whose sum is σ = 1764016017792. Its totient is φ = 189001716144.

The previous prime is 661506006587. The next prime is 661506006643. The reversal of 661506006588 is 885600605166.

It is a self number, because there is not a number n which added to its sum of digits gives 661506006588.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3937535670 + ... + 3937535837.

It is an arithmetic number, because the mean of its divisors is an integer number (73500667408).

Almost surely, 2^661506006588 is an apocalyptic number.

It is an amenable number.

661506006588 is an abundant number, since it is smaller than the sum of its proper divisors (1102510011204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661506006588 is a wasteful number, since it uses less digits than its factorization.

661506006588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7875071521 (or 7875071519 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 51.

The spelling of 661506006588 in words is "six hundred sixty-one billion, five hundred six million, six thousand, five hundred eighty-eight".