66949558 has 8 divisors (see below), whose sum is σ = 108149328. Its totient is φ = 30899784.

The previous prime is 66949537. The next prime is 66949591. The reversal of 66949558 is 85594966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1287466 + ... + 1287517.

It is an arithmetic number, because the mean of its divisors is an integer number (13518666).

Almost surely, 2^66949558 is an apocalyptic number.

66949558 is a deficient number, since it is larger than the sum of its proper divisors (41199770).

66949558 is a wasteful number, since it uses less digits than its factorization.

66949558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574998.

The product of its digits is 2332800, while the sum is 52.

The square root of 66949558 is about 8182.2709561588. The cubic root of 66949558 is about 406.0528577835.

The spelling of 66949558 in words is "sixty-six million, nine hundred forty-nine thousand, five hundred fifty-eight".