66497976 has 64 divisors (see below), whose sum is σ = 190694400. Its totient is φ = 21448800.

The previous prime is 66497971. The next prime is 66497989. The reversal of 66497976 is 67979466.

66497976 is a `hidden beast` number, since 66 + 497 + 97 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66497971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1731 + ... + 11661.

It is an arithmetic number, because the mean of its divisors is an integer number (2979600).

Almost surely, 2^66497976 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 66497976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95347200).

66497976 is an abundant number, since it is smaller than the sum of its proper divisors (124196424).

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

66497976 is a wasteful number, since it uses less digits than its factorization.

66497976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9977 (or 9967 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The square root of 66497976 is about 8154.6291148034. The cubic root of 66497976 is about 405.1378405982.

The spelling of 66497976 in words is "sixty-six million, four hundred ninety-seven thousand, nine hundred seventy-six".