611215660 has 48 divisors (see below), whose sum is σ = 1406522880. Its totient is φ = 221263040.

The previous prime is 611215651. The next prime is 611215667. The reversal of 611215660 is 66512116.

It is not an unprimeable number, because it can be changed into a prime (611215667) 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, 43821 + ... + 56059.

It is an arithmetic number, because the mean of its divisors is an integer number (29302560).

Almost surely, 2^611215660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 611215660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703261440).

611215660 is an abundant number, since it is smaller than the sum of its proper divisors (795307220).

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

611215660 is a wasteful number, since it uses less digits than its factorization.

611215660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12486 (or 12484 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 611215660 is about 24722.7761386136. The cubic root of 611215660 is about 848.6556187587.

Adding to 611215660 its reverse (66512116), we get a palindrome (677727776).

The spelling of 611215660 in words is "six hundred eleven million, two hundred fifteen thousand, six hundred sixty".