612561660 has 96 divisors (see below), whose sum is σ = 1764322560. Its totient is φ = 158710272.

The previous prime is 612561647. The next prime is 612561673. The reversal of 612561660 is 66165216.

612561660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (612561647) and next prime (612561673).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 600631 + ... + 601649.

It is an arithmetic number, because the mean of its divisors is an integer number (18378360).

Almost surely, 2^612561660 is an apocalyptic number.

612561660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 612561660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (882161280).

612561660 is an abundant number, since it is smaller than the sum of its proper divisors (1151760900).

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

612561660 is a wasteful number, since it uses less digits than its factorization.

612561660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307 (or 1305 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 612561660 is about 24749.9830302972. The cubic root of 612561660 is about 849.2781229780.

The spelling of 612561660 in words is "six hundred twelve million, five hundred sixty-one thousand, six hundred sixty".