66461764 has 6 divisors (see below), whose sum is σ = 116308094. Its totient is φ = 33230880.

The previous prime is 66461761. The next prime is 66461771. The reversal of 66461764 is 46716466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 49815364 + 16646400 = 7058^2 + 4080^2 .

It is not an unprimeable number, because it can be changed into a prime (66461761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8307717 + ... + 8307724.

Almost surely, 2^66461764 is an apocalyptic number.

It is an amenable number.

66461764 is a deficient number, since it is larger than the sum of its proper divisors (49846330).

66461764 is a wasteful number, since it uses less digits than its factorization.

66461764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16615445 (or 16615443 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 66461764 is about 8152.4084784805. The cubic root of 66461764 is about 405.0642869042.

The spelling of 66461764 in words is "sixty-six million, four hundred sixty-one thousand, seven hundred sixty-four".