551661605588 has 24 divisors (see below), whose sum is σ = 991544864352. Its totient is φ = 268363749024.

The previous prime is 551661605563. The next prime is 551661605591. The reversal of 551661605588 is 885506166155.

It is a happy number.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3788831 + ... + 3931737.

It is an arithmetic number, because the mean of its divisors is an integer number (41314369348).

Almost surely, 2^551661605588 is an apocalyptic number.

It is an amenable number.

551661605588 is a deficient number, since it is larger than the sum of its proper divisors (439883258764).

551661605588 is a wasteful number, since it uses less digits than its factorization.

551661605588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169031 (or 169029 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 56.

The spelling of 551661605588 in words is "five hundred fifty-one billion, six hundred sixty-one million, six hundred five thousand, five hundred eighty-eight".