66951860 has 48 divisors (see below), whose sum is σ = 145238016. Its totient is φ = 25909632.

The previous prime is 66951823. The next prime is 66951869. The reversal of 66951860 is 6815966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66951869) 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, 108914 + ... + 109526.

It is an arithmetic number, because the mean of its divisors is an integer number (3025792).

Almost surely, 2^66951860 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 66951860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72619008).

66951860 is an abundant number, since it is smaller than the sum of its proper divisors (78286156).

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

66951860 is a wasteful number, since it uses less digits than its factorization.

66951860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792 (or 790 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 66951860 is about 8182.4116249429. The cubic root of 66951860 is about 406.0575116503.

The spelling of 66951860 in words is "sixty-six million, nine hundred fifty-one thousand, eight hundred sixty".