66810046 has 8 divisors (see below), whose sum is σ = 102545784. Its totient is φ = 32628120.

The previous prime is 66810043. The next prime is 66810047. The reversal of 66810046 is 64001866.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66810041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388345 + ... + 388516.

It is an arithmetic number, because the mean of its divisors is an integer number (12818223).

Almost surely, 2^66810046 is an apocalyptic number.

66810046 is a deficient number, since it is larger than the sum of its proper divisors (35735738).

66810046 is a wasteful number, since it uses less digits than its factorization.

66810046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776906.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 66810046 is about 8173.7412486572. The cubic root of 66810046 is about 405.7706122498.

The spelling of 66810046 in words is "sixty-six million, eight hundred ten thousand, forty-six".