66671642 has 8 divisors (see below), whose sum is σ = 100191936. Its totient is φ = 33274332.

The previous prime is 66671639. The next prime is 66671651. The reversal of 66671642 is 24617666.

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

It is a junction number, because it is equal to n+sod(n) for n = 66671596 and 66671605.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29378 + ... + 31565.

It is an arithmetic number, because the mean of its divisors is an integer number (12523992).

Almost surely, 2^66671642 is an apocalyptic number.

66671642 is a deficient number, since it is larger than the sum of its proper divisors (33520294).

66671642 is a wasteful number, since it uses less digits than its factorization.

66671642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61492.

The product of its digits is 72576, while the sum is 38.

The square root of 66671642 is about 8165.2704792922. The cubic root of 66671642 is about 405.4902197814.

The spelling of 66671642 in words is "sixty-six million, six hundred seventy-one thousand, six hundred forty-two".