65166813 has 18 divisors (see below), whose sum is σ = 95614974. Its totient is φ = 42769584.

The previous prime is 65166793. The next prime is 65166817. The reversal of 65166813 is 31866156.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 58339044 + 6827769 = 7638^2 + 2613^2 .

It is not a de Polignac number, because 65166813 - 2⁶ = 65166749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65166817) 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 17 ways as a sum of consecutive naturals, for example, 39595 + ... + 41207.

It is an arithmetic number, because the mean of its divisors is an integer number (5311943).

Almost surely, 2^65166813 is an apocalyptic number.

It is an amenable number.

65166813 is a deficient number, since it is larger than the sum of its proper divisors (30448161).

65166813 is a wasteful number, since it uses less digits than its factorization.

65166813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753 (or 1683 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 65166813 is about 8072.5964224653. The cubic root of 65166813 is about 402.4162355427.

The spelling of 65166813 in words is "sixty-five million, one hundred sixty-six thousand, eight hundred thirteen".