65166321 has 24 divisors (see below), whose sum is σ = 100705824. Its totient is φ = 37166080.

The previous prime is 65166319. The next prime is 65166341. The reversal of 65166321 is 12366156.

It is not a de Polignac number, because 65166321 - 2¹ = 65166319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65166341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6121 + ... + 12953.

It is an arithmetic number, because the mean of its divisors is an integer number (4196076).

Almost surely, 2^65166321 is an apocalyptic number.

It is an amenable number.

65166321 is a deficient number, since it is larger than the sum of its proper divisors (35539503).

65166321 is a wasteful number, since it uses less digits than its factorization.

65166321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6881 (or 6864 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 65166321 is about 8072.5659489409. The cubic root of 65166321 is about 402.4152228121.

The spelling of 65166321 in words is "sixty-five million, one hundred sixty-six thousand, three hundred twenty-one".