66401574 has 16 divisors (see below), whose sum is σ = 133300080. Its totient is φ = 22051040.

The previous prime is 66401563. The next prime is 66401593. The reversal of 66401574 is 47510466.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18957 + ... + 22184.

It is an arithmetic number, because the mean of its divisors is an integer number (8331255).

Almost surely, 2^66401574 is an apocalyptic number.

66401574 is an abundant number, since it is smaller than the sum of its proper divisors (66898506).

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

66401574 is a wasteful number, since it uses less digits than its factorization.

66401574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41415.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 66401574 is about 8148.7160951895. The cubic root of 66401574 is about 404.9419700426.

The spelling of 66401574 in words is "sixty-six million, four hundred one thousand, five hundred seventy-four".