6660299520 has 1296 divisors, whose sum is σ = 30534416640. Its totient is φ = 1379524608.

The previous prime is 6660299447. The next prime is 6660299533. The reversal of 6660299520 is 259920666.

It is a tau number, because it is divible by the number of its divisors (1296).

It is a super-2 number, since 2×6660299520² = 88719179392224460800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 289578229 + ... + 289578251.

Almost surely, 2^6660299520 is an apocalyptic number.

6660299520 is a gapful number since it is divisible by the number (60) 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 6660299520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15267208320).

6660299520 is an abundant number, since it is smaller than the sum of its proper divisors (23874117120).

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

6660299520 is a wasteful number, since it uses less digits than its factorization.

6660299520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 6660299520 is about 81610.6581274774. The cubic root of 6660299520 is about 1881.4726954687.

The spelling of 6660299520 in words is "six billion, six hundred sixty million, two hundred ninety-nine thousand, five hundred twenty".