65670161 has 4 divisors (see below), whose sum is σ = 65688612. Its totient is φ = 65651712.

The previous prime is 65670149. The next prime is 65670173. The reversal of 65670161 is 16107656.

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

It is an interprime number because it is at equal distance from previous prime (65670149) and next prime (65670173).

It can be written as a sum of positive squares in 2 ways, for example, as 24196561 + 41473600 = 4919^2 + 6440^2 .

It is a cyclic number.

It is not a de Polignac number, because 65670161 - 2¹⁸ = 65408017 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65670131) 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 in 3 ways as a sum of consecutive naturals, for example, 2000 + ... + 11633.

It is an arithmetic number, because the mean of its divisors is an integer number (16422153).

Almost surely, 2^65670161 is an apocalyptic number.

It is an amenable number.

65670161 is a deficient number, since it is larger than the sum of its proper divisors (18451).

65670161 is a wasteful number, since it uses less digits than its factorization.

65670161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18450.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 65670161 is about 8103.7127910607. The cubic root of 65670161 is about 403.4496660690.

The spelling of 65670161 in words is "sixty-five million, six hundred seventy thousand, one hundred sixty-one".