66165960 has 128 divisors (see below), whose sum is σ = 228510720. Its totient is φ = 15013632.

The previous prime is 66165937. The next prime is 66165971. The reversal of 66165960 is 6956166.

66165960 = T₄₁ + T₄₂ + ... + T₇₃₄.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190507 + ... + 190853.

It is an arithmetic number, because the mean of its divisors is an integer number (1785240).

Almost surely, 2^66165960 is an apocalyptic number.

66165960 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 66165960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114255360).

66165960 is an abundant number, since it is smaller than the sum of its proper divisors (162344760).

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

66165960 is a wasteful number, since it uses less digits than its factorization.

66165960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 66165960 is about 8134.2461236429. The cubic root of 66165960 is about 404.4624479322.

The spelling of 66165960 in words is "sixty-six million, one hundred sixty-five thousand, nine hundred sixty".