66495660 has 192 divisors, whose sum is σ = 239016960. Its totient is φ = 13409280.

The previous prime is 66495631. The next prime is 66495677. The reversal of 66495660 is 6659466.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 170746 + ... + 171134.

It is an arithmetic number, because the mean of its divisors is an integer number (1244880).

Almost surely, 2^66495660 is an apocalyptic number.

66495660 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 66495660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119508480).

66495660 is an abundant number, since it is smaller than the sum of its proper divisors (172521300).

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

66495660 is a wasteful number, since it uses less digits than its factorization.

66495660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 66495660 is about 8154.4871083349. The cubic root of 66495660 is about 405.1331371461.

The spelling of 66495660 in words is "sixty-six million, four hundred ninety-five thousand, six hundred sixty".