1611100660 has 72 divisors (see below), whose sum is σ = 3698042040. Its totient is φ = 589275648.

The previous prime is 1611100643. The next prime is 1611100661. The reversal of 1611100660 is 660011161.

It can be written as a sum of positive squares in 12 ways, for example, as 693374224 + 917726436 = 26332^2 + 30294^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1611100661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 366234 + ... + 370606.

It is an arithmetic number, because the mean of its divisors is an integer number (51361695).

Almost surely, 2^1611100660 is an apocalyptic number.

1611100660 is a gapful number since it is divisible by the number (10) 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 1611100660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1849021020).

1611100660 is an abundant number, since it is smaller than the sum of its proper divisors (2086941380).

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

1611100660 is a wasteful number, since it uses less digits than its factorization.

1611100660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517 (or 4502 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1611100660 is about 40138.5184081326. The cubic root of 1611100660 is about 1172.3057411133.

The spelling of 1611100660 in words is "one billion, six hundred eleven million, one hundred thousand, six hundred sixty".