66501404 has 24 divisors (see below), whose sum is σ = 118244448. Its totient is φ = 32721920.

The previous prime is 66501403. The next prime is 66501451. The reversal of 66501404 is 40410566.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66501401) 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 7 ways as a sum of consecutive naturals, for example, 75044 + ... + 75924.

It is an arithmetic number, because the mean of its divisors is an integer number (4926852).

Almost surely, 2^66501404 is an apocalyptic number.

It is an amenable number.

66501404 is a deficient number, since it is larger than the sum of its proper divisors (51743044).

66501404 is a wasteful number, since it uses less digits than its factorization.

66501404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165 (or 1163 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 66501404 is about 8154.8392994589. The cubic root of 66501404 is about 405.1448021567.

The spelling of 66501404 in words is "sixty-six million, five hundred one thousand, four hundred four".