1660642560 has 432 divisors, whose sum is σ = 6294375360. Its totient is φ = 418037760.

The previous prime is 1660642549. The next prime is 1660642597. The reversal of 1660642560 is 652460661.

It is a happy number.

1660642560 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 642 + 5 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5909620 + ... + 5909900.

Almost surely, 2^1660642560 is an apocalyptic number.

1660642560 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 1660642560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3147187680).

1660642560 is an abundant number, since it is smaller than the sum of its proper divisors (4633732800).

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

1660642560 is an equidigital number, since it uses as much as digits as its factorization.

1660642560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1660642560 is about 40750.9823194484. The cubic root of 1660642560 is about 1184.2009033323.

The spelling of 1660642560 in words is "one billion, six hundred sixty million, six hundred forty-two thousand, five hundred sixty".