1660739520 has 504 divisors, whose sum is σ = 6355610352. Its totient is φ = 365854720.

The previous prime is 1660739489. The next prime is 1660739527. The reversal of 1660739520 is 259370661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660739527) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 57266866 + ... + 57266894.

It is an arithmetic number, because the mean of its divisors is an integer number (12610338).

Almost surely, 2^1660739520 is an apocalyptic number.

1660739520 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 1660739520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3177805176).

1660739520 is an abundant number, since it is smaller than the sum of its proper divisors (4694870832).

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

1660739520 is a wasteful number, since it uses less digits than its factorization.

1660739520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 1660739520 is about 40752.1719666572. The cubic root of 1660739520 is about 1184.2239502114.

The spelling of 1660739520 in words is "one billion, six hundred sixty million, seven hundred thirty-nine thousand, five hundred twenty".