66919794 has 16 divisors (see below), whose sum is σ = 135534720. Its totient is φ = 22024080.

The previous prime is 66919789. The next prime is 66919799. The reversal of 66919794 is 49791966.

It is an interprime number because it is at equal distance from previous prime (66919789) and next prime (66919799).

It is not an unprimeable number, because it can be changed into a prime (66919799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70117 + ... + 71064.

It is an arithmetic number, because the mean of its divisors is an integer number (8470920).

Almost surely, 2^66919794 is an apocalyptic number.

66919794 is an abundant number, since it is smaller than the sum of its proper divisors (68614926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66919794 is a wasteful number, since it uses less digits than its factorization.

66919794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141265.

The product of its digits is 734832, while the sum is 51.

The square root of 66919794 is about 8180.4519435053. The cubic root of 66919794 is about 405.9926754161.

The spelling of 66919794 in words is "sixty-six million, nine hundred nineteen thousand, seven hundred ninety-four".