1611607660 has 72 divisors (see below), whose sum is σ = 3676183056. Its totient is φ = 593199360.

The previous prime is 1611607637. The next prime is 1611607693. The reversal of 1611607660 is 667061161.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1577950 + ... + 1578970.

It is an arithmetic number, because the mean of its divisors is an integer number (51058098).

Almost surely, 2^1611607660 is an apocalyptic number.

1611607660 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 1611607660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1838091528).

1611607660 is an abundant number, since it is smaller than the sum of its proper divisors (2064575396).

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

1611607660 is a wasteful number, since it uses less digits than its factorization.

1611607660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523 (or 1508 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1611607660 is about 40144.8335405691. The cubic root of 1611607660 is about 1172.4286998437.

The spelling of 1611607660 in words is "one billion, six hundred eleven million, six hundred seven thousand, six hundred sixty".