66951444 has 72 divisors (see below), whose sum is σ = 187638528. Its totient is φ = 18506880.

The previous prime is 66951433. The next prime is 66951449. The reversal of 66951444 is 44415966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66951449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16392 + ... + 20064.

Almost surely, 2^66951444 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 66951444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93819264).

66951444 is an abundant number, since it is smaller than the sum of its proper divisors (120687084).

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

66951444 is a wasteful number, since it uses less digits than its factorization.

66951444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3725 (or 3716 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 66951444 is about 8182.3862045249. The cubic root of 66951444 is about 406.0566706467.

It can be divided in two parts, 66 and 951444, that added together give a triangular number (951510 = T₁₃₇₉).

The spelling of 66951444 in words is "sixty-six million, nine hundred fifty-one thousand, four hundred forty-four".