66015560 has 64 divisors (see below), whose sum is σ = 162086400. Its totient is φ = 24051456.

The previous prime is 66015553. The next prime is 66015619. The reversal of 66015560 is 6551066.

It is a super-2 number, since 2×66015560² = 8716108324227200, which contains 22 as substring.

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, 40277 + ... + 41883.

It is an arithmetic number, because the mean of its divisors is an integer number (2532600).

Almost surely, 2^66015560 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 66015560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81043200).

66015560 is an abundant number, since it is smaller than the sum of its proper divisors (96070840).

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

66015560 is a wasteful number, since it uses less digits than its factorization.

66015560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710 (or 1706 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 66015560 is about 8124.9959999990. The cubic root of 66015560 is about 404.1557579985.

The spelling of 66015560 in words is "sixty-six million, fifteen thousand, five hundred sixty".