66679406 has 16 divisors (see below), whose sum is σ = 107903664. Its totient is φ = 30785664.

The previous prime is 66679399. The next prime is 66679409. The reversal of 66679406 is 60497666.

It is a super-2 number, since 2×66679406² = 8892286369025672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66679409) 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 in 7 ways as a sum of consecutive naturals, for example, 16700 + ... + 20303.

It is an arithmetic number, because the mean of its divisors is an integer number (6743979).

Almost surely, 2^66679406 is an apocalyptic number.

66679406 is a deficient number, since it is larger than the sum of its proper divisors (41224258).

66679406 is a wasteful number, since it uses less digits than its factorization.

66679406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37075.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 66679406 is about 8165.7458936707. The cubic root of 66679406 is about 405.5059591261.

The spelling of 66679406 in words is "sixty-six million, six hundred seventy-nine thousand, four hundred six".