66521342 has 4 divisors (see below), whose sum is σ = 99782016. Its totient is φ = 33260670.

The previous prime is 66521341. The next prime is 66521347. The reversal of 66521342 is 24312566.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66521341) 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 as a sum of consecutive naturals, namely, 16630334 + ... + 16630337.

It is an arithmetic number, because the mean of its divisors is an integer number (24945504).

Almost surely, 2^66521342 is an apocalyptic number.

66521342 is a deficient number, since it is larger than the sum of its proper divisors (33260674).

66521342 is a wasteful number, since it uses less digits than its factorization.

66521342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33260673.

The product of its digits is 8640, while the sum is 29.

The square root of 66521342 is about 8156.0616721553. The cubic root of 66521342 is about 405.1852873667.

The spelling of 66521342 in words is "sixty-six million, five hundred twenty-one thousand, three hundred forty-two".