65642066 has 72 divisors (see below), whose sum is σ = 128371068. Its totient is φ = 24998400.

The previous prime is 65642053. The next prime is 65642077. The reversal of 65642066 is 66024656.

It can be written as a sum of positive squares in 2 ways, for example, as 64464841 + 1177225 = 8029^2 + 1085^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1601006 + ... + 1601046.

Almost surely, 2^65642066 is an apocalyptic number.

65642066 is a deficient number, since it is larger than the sum of its proper divisors (62729002).

65642066 is a wasteful number, since it uses less digits than its factorization.

65642066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 65642066 is about 8101.9791409260. The cubic root of 65642066 is about 403.3921232671.

The spelling of 65642066 in words is "sixty-five million, six hundred forty-two thousand, sixty-six".