555561660 has 48 divisors (see below), whose sum is σ = 1597621536. Its totient is φ = 144145152.

The previous prime is 555561659. The next prime is 555561661. The reversal of 555561660 is 66165555.

It is an interprime number because it is at equal distance from previous prime (555561659) and next prime (555561661).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555561661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122907 + ... + 127346.

It is an arithmetic number, because the mean of its divisors is an integer number (33283782).

Almost surely, 2^555561660 is an apocalyptic number.

It is an amenable number.

555561660 is an abundant number, since it is smaller than the sum of its proper divisors (1042059876).

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

555561660 is a wasteful number, since it uses less digits than its factorization.

555561660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250302 (or 250300 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 555561660 is about 23570.3555340177. The cubic root of 555561660 is about 822.0737024034.

The spelling of 555561660 in words is "five hundred fifty-five million, five hundred sixty-one thousand, six hundred sixty".