1660725320 has 32 divisors (see below), whose sum is σ = 3807139320. Its totient is φ = 651755520.

The previous prime is 1660725299. The next prime is 1660725323. The reversal of 1660725320 is 235270661.

It can be written as a sum of positive squares in 4 ways, for example, as 1586110276 + 74615044 = 39826^2 + 8638^2 .

It is not an unprimeable number, because it can be changed into a prime (1660725323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389561 + ... + 393800.

Almost surely, 2^1660725320 is an apocalyptic number.

1660725320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660725320 is an abundant number, since it is smaller than the sum of its proper divisors (2146414000).

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

1660725320 is a wasteful number, since it uses less digits than its factorization.

1660725320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783425 (or 783421 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 1660725320 is about 40751.9977424420. The cubic root of 1660725320 is about 1184.2205750026.

Adding to 1660725320 its reverse (235270661), we get a palindrome (1895995981).

The spelling of 1660725320 in words is "one billion, six hundred sixty million, seven hundred twenty-five thousand, three hundred twenty".