66671782 has 4 divisors (see below), whose sum is σ = 100007676. Its totient is φ = 33335890.

The previous prime is 66671771. The next prime is 66671791. The reversal of 66671782 is 28717666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16667944 + ... + 16667947.

It is an arithmetic number, because the mean of its divisors is an integer number (25001919).

Almost surely, 2^66671782 is an apocalyptic number.

66671782 is a deficient number, since it is larger than the sum of its proper divisors (33335894).

66671782 is a wasteful number, since it uses less digits than its factorization.

66671782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33335893.

The product of its digits is 169344, while the sum is 43.

The square root of 66671782 is about 8165.2790521819. The cubic root of 66671782 is about 405.4905036032.

The spelling of 66671782 in words is "sixty-six million, six hundred seventy-one thousand, seven hundred eighty-two".