515401660 has 48 divisors (see below), whose sum is σ = 1120654080. Its totient is φ = 198904320.

The previous prime is 515401651. The next prime is 515401703. The reversal of 515401660 is 66104515.

It is a super-2 number, since 2×515401660² = 531277742261511200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240112 + ... + 242248.

It is an arithmetic number, because the mean of its divisors is an integer number (23346960).

Almost surely, 2^515401660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 515401660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (560327040).

515401660 is an abundant number, since it is smaller than the sum of its proper divisors (605252420).

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

515401660 is a wasteful number, since it uses less digits than its factorization.

515401660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566 (or 2564 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 515401660 is about 22702.4593381422. The cubic root of 515401660 is about 801.7677886933.

The spelling of 515401660 in words is "five hundred fifteen million, four hundred one thousand, six hundred sixty".