66774770 has 8 divisors (see below), whose sum is σ = 120194604. Its totient is φ = 26709904.

The previous prime is 66774749. The next prime is 66774787. The reversal of 66774770 is 7747766.

It can be written as a sum of positive squares in 2 ways, for example, as 66210769 + 564001 = 8137^2 + 751^2 .

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

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, 3338729 + ... + 3338748.

Almost surely, 2^66774770 is an apocalyptic number.

66774770 is a deficient number, since it is larger than the sum of its proper divisors (53419834).

66774770 is a wasteful number, since it uses less digits than its factorization.

66774770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6677484.

The product of its (nonzero) digits is 345744, while the sum is 44.

The square root of 66774770 is about 8171.5830779599. The cubic root of 66774770 is about 405.6991834504.

It can be divided in two parts, 6 and 6774770, that added together give a palindrome (6774776).

The spelling of 66774770 in words is "sixty-six million, seven hundred seventy-four thousand, seven hundred seventy".