1660637860 has 96 divisors (see below), whose sum is σ = 4260066048. Its totient is φ = 530780160.

The previous prime is 1660637851. The next prime is 1660637861. The reversal of 1660637860 is 687360661.

It is not an unprimeable number, because it can be changed into a prime (1660637861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251400 + ... + 257920.

It is an arithmetic number, because the mean of its divisors is an integer number (44375688).

Almost surely, 2^1660637860 is an apocalyptic number.

1660637860 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 1660637860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2130033024).

1660637860 is an abundant number, since it is smaller than the sum of its proper divisors (2599428188).

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

1660637860 is a wasteful number, since it uses less digits than its factorization.

1660637860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6661 (or 6659 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 1660637860 is about 40750.9246520861. The cubic root of 1660637860 is about 1184.1997861444.

The spelling of 1660637860 in words is "one billion, six hundred sixty million, six hundred thirty-seven thousand, eight hundred sixty".