1660508640 has 384 divisors, whose sum is σ = 6801822720. Its totient is φ = 370427904.

The previous prime is 1660508639. The next prime is 1660508659. The reversal of 1660508640 is 468050661.

1660508640 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 5 + 0 + 8 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1660508595 and 1660508604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1299682 + ... + 1300958.

It is an arithmetic number, because the mean of its divisors is an integer number (17713080).

Almost surely, 2^1660508640 is an apocalyptic number.

1660508640 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 1660508640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3400911360).

1660508640 is an abundant number, since it is smaller than the sum of its proper divisors (5141314080).

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

1660508640 is a wasteful number, since it uses less digits than its factorization.

1660508640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351 (or 1337 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1660508640 is about 40749.3391357455. The cubic root of 1660508640 is about 1184.1690697815.

The spelling of 1660508640 in words is "one billion, six hundred sixty million, five hundred eight thousand, six hundred forty".