611666560 has 32 divisors (see below), whose sum is σ = 1462266900. Its totient is φ = 244666368.

The previous prime is 611666551. The next prime is 611666599. The reversal of 611666560 is 65666116.

It can be written as a sum of positive squares in 2 ways, for example, as 598878784 + 12787776 = 24472^2 + 3576^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477225 + ... + 478504.

Almost surely, 2^611666560 is an apocalyptic number.

It is an amenable number.

611666560 is an abundant number, since it is smaller than the sum of its proper divisors (850600340).

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

611666560 is an equidigital number, since it uses as much as digits as its factorization.

611666560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955748 (or 955736 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 611666560 is about 24731.8935789397. The cubic root of 611666560 is about 848.8642547525.

The spelling of 611666560 in words is "six hundred eleven million, six hundred sixty-six thousand, five hundred sixty".