66687442 has 16 divisors (see below), whose sum is σ = 105017472. Its totient is φ = 31699360.

The previous prime is 66687421. The next prime is 66687463. The reversal of 66687442 is 24478666.

It is an interprime number because it is at equal distance from previous prime (66687421) and next prime (66687463).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3342 + ... + 12022.

It is an arithmetic number, because the mean of its divisors is an integer number (6563592).

Almost surely, 2^66687442 is an apocalyptic number.

66687442 is a deficient number, since it is larger than the sum of its proper divisors (38330030).

66687442 is a wasteful number, since it uses less digits than its factorization.

66687442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8873.

The product of its digits is 387072, while the sum is 43.

The square root of 66687442 is about 8166.2379343245. The cubic root of 66687442 is about 405.5222485883.

The spelling of 66687442 in words is "sixty-six million, six hundred eighty-seven thousand, four hundred forty-two".