6665515560 has 384 divisors, whose sum is σ = 24584601600. Its totient is φ = 1552135680.

The previous prime is 6665515489. The next prime is 6665515583. The reversal of 6665515560 is 655155666.

It is a super-2 number, since 2×6665515560² = 88858195361204227200, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10980777 + ... + 10981383.

It is an arithmetic number, because the mean of its divisors is an integer number (64022400).

Almost surely, 2^6665515560 is an apocalyptic number.

6665515560 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 6665515560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12292300800).

6665515560 is an abundant number, since it is smaller than the sum of its proper divisors (17919086040).

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

6665515560 is a wasteful number, since it uses less digits than its factorization.

6665515560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The square root of 6665515560 is about 81642.6087285310. The cubic root of 6665515560 is about 1881.9637282422.

It can be divided in two parts, 66655 and 15560, that added together give a triangular number (82215 = T₄₀₅).

The spelling of 6665515560 in words is "six billion, six hundred sixty-five million, five hundred fifteen thousand, five hundred sixty".