66440254 has 32 divisors (see below), whose sum is σ = 107412480. Its totient is φ = 30763200.

The previous prime is 66440251. The next prime is 66440263. The reversal of 66440254 is 45204466.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66440251) 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, 149757 + ... + 150199.

It is an arithmetic number, because the mean of its divisors is an integer number (3356640).

Almost surely, 2^66440254 is an apocalyptic number.

66440254 is a deficient number, since it is larger than the sum of its proper divisors (40972226).

66440254 is a wasteful number, since it uses less digits than its factorization.

66440254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 66440254 is about 8151.0891296808. The cubic root of 66440254 is about 405.0205832144.

The spelling of 66440254 in words is "sixty-six million, four hundred forty thousand, two hundred fifty-four".