66521450 has 24 divisors (see below), whose sum is σ = 126366912. Its totient is φ = 26041520.

The previous prime is 66521383. The next prime is 66521461. The reversal of 66521450 is 5412566.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11804 + ... + 16503.

It is an arithmetic number, because the mean of its divisors is an integer number (5265288).

Almost surely, 2^66521450 is an apocalyptic number.

66521450 is a deficient number, since it is larger than the sum of its proper divisors (59845462).

66521450 is a wasteful number, since it uses less digits than its factorization.

66521450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28366 (or 28361 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 66521450 is about 8156.0682929951. The cubic root of 66521450 is about 405.1855066447.

The spelling of 66521450 in words is "sixty-six million, five hundred twenty-one thousand, four hundred fifty".