66649502 has 4 divisors (see below), whose sum is σ = 99974256. Its totient is φ = 33324750.

The previous prime is 66649489. The next prime is 66649529. The reversal of 66649502 is 20594666.

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

It is a super-2 number, since 2×66649502² = 8884312233696008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16662374 + ... + 16662377.

It is an arithmetic number, because the mean of its divisors is an integer number (24993564).

Almost surely, 2^66649502 is an apocalyptic number.

66649502 is a deficient number, since it is larger than the sum of its proper divisors (33324754).

66649502 is a wasteful number, since it uses less digits than its factorization.

66649502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33324753.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 66649502 is about 8163.9146247373. The cubic root of 66649502 is about 405.4453303946.

The spelling of 66649502 in words is "sixty-six million, six hundred forty-nine thousand, five hundred two".