66457894 has 4 divisors (see below), whose sum is σ = 99686844. Its totient is φ = 33228946.

The previous prime is 66457829. The next prime is 66457907. The reversal of 66457894 is 49875466.

66457894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16614472 + ... + 16614475.

It is an arithmetic number, because the mean of its divisors is an integer number (24921711).

Almost surely, 2^66457894 is an apocalyptic number.

66457894 is a deficient number, since it is larger than the sum of its proper divisors (33228950).

66457894 is a wasteful number, since it uses less digits than its factorization.

66457894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33228949.

The product of its digits is 1451520, while the sum is 49.

The square root of 66457894 is about 8152.1711218546. The cubic root of 66457894 is about 405.0564245930.

The spelling of 66457894 in words is "sixty-six million, four hundred fifty-seven thousand, eight hundred ninety-four".