1655666560 has 32 divisors (see below), whose sum is σ = 3958079400. Its totient is φ = 662266368.

The previous prime is 1655666543. The next prime is 1655666609. The reversal of 1655666560 is 656665561.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1655666560.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1292850 + ... + 1294129.

Almost surely, 2^1655666560 is an apocalyptic number.

1655666560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1655666560 is an abundant number, since it is smaller than the sum of its proper divisors (2302412840).

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

1655666560 is an equidigital number, since it uses as much as digits as its factorization.

1655666560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586998 (or 2586986 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 46.

The square root of 1655666560 is about 40689.8827720110. The cubic root of 1655666560 is about 1183.0169280795.

Subtracting from 1655666560 its reverse (656665561), we obtain a palindrome (999000999).

The spelling of 1655666560 in words is "one billion, six hundred fifty-five million, six hundred sixty-six thousand, five hundred sixty".