1611355680 has 480 divisors, whose sum is σ = 6322821120. Its totient is φ = 383201280.

The previous prime is 1611355657. The next prime is 1611355741. The reversal of 1611355680 is 865531161.

1611355680 is a `hidden beast` number, since 1 + 61 + 1 + 35 + 568 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 12687777 + ... + 12687903.

It is an arithmetic number, because the mean of its divisors is an integer number (13172544).

Almost surely, 2^1611355680 is an apocalyptic number.

1611355680 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 1611355680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3161410560).

1611355680 is an abundant number, since it is smaller than the sum of its proper divisors (4711465440).

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

1611355680 is a wasteful number, since it uses less digits than its factorization.

1611355680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 1611355680 is about 40141.6950314757. The cubic root of 1611355680 is about 1172.3675923360.

The spelling of 1611355680 in words is "one billion, six hundred eleven million, three hundred fifty-five thousand, six hundred eighty".