66549954 has 32 divisors (see below), whose sum is σ = 139144320. Its totient is φ = 21192192.

The previous prime is 66549947. The next prime is 66549991. The reversal of 66549954 is 45994566.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14907 + ... + 18849.

It is an arithmetic number, because the mean of its divisors is an integer number (4348260).

Almost surely, 2^66549954 is an apocalyptic number.

66549954 is an abundant number, since it is smaller than the sum of its proper divisors (72594366).

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

66549954 is a wasteful number, since it uses less digits than its factorization.

66549954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074.

The product of its digits is 1166400, while the sum is 48.

The square root of 66549954 is about 8157.8155164235. The cubic root of 66549954 is about 405.2433714810.

The spelling of 66549954 in words is "sixty-six million, five hundred forty-nine thousand, nine hundred fifty-four".