551611561660 has 24 divisors (see below), whose sum is σ = 1160261751600. Its totient is φ = 220287010944.

The previous prime is 551611561651. The next prime is 551611561687. The reversal of 551611561660 is 66165116155.

551611561660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 22338210 + ... + 22362889.

It is an arithmetic number, because the mean of its divisors is an integer number (48344239650).

Almost surely, 2^551611561660 is an apocalyptic number.

It is an amenable number.

551611561660 is an abundant number, since it is smaller than the sum of its proper divisors (608650189940).

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

551611561660 is a wasteful number, since it uses less digits than its factorization.

551611561660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44701725 (or 44701723 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 551611561660 in words is "five hundred fifty-one billion, six hundred eleven million, five hundred sixty-one thousand, six hundred sixty".