65155666 has 4 divisors (see below), whose sum is σ = 97733502. Its totient is φ = 32577832.

The previous prime is 65155661. The next prime is 65155667. The reversal of 65155666 is 66655156.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 594441 = 8035^2 + 771^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (65155661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16288915 + ... + 16288918.

Almost surely, 2^65155666 is an apocalyptic number.

65155666 is a deficient number, since it is larger than the sum of its proper divisors (32577836).

65155666 is a wasteful number, since it uses less digits than its factorization.

65155666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32577835.

The product of its digits is 162000, while the sum is 40.

The square root of 65155666 is about 8071.9059707110. The cubic root of 65155666 is about 402.3932893561.

The spelling of 65155666 in words is "sixty-five million, one hundred fifty-five thousand, six hundred sixty-six".