66312361 has 4 divisors (see below), whose sum is σ = 66460500. Its totient is φ = 66164224.

The previous prime is 66312349. The next prime is 66312371. The reversal of 66312361 is 16321366.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14745600 + 51566761 = 3840^2 + 7181^2 .

It is a cyclic number.

It is not a de Polignac number, because 66312361 - 2⁵ = 66312329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66312341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73396 + ... + 74293.

It is an arithmetic number, because the mean of its divisors is an integer number (16615125).

Almost surely, 2^66312361 is an apocalyptic number.

It is an amenable number.

66312361 is a deficient number, since it is larger than the sum of its proper divisors (148139).

66312361 is a wasteful number, since it uses less digits than its factorization.

66312361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148138.

The product of its digits is 3888, while the sum is 28.

The square root of 66312361 is about 8143.2402027694. The cubic root of 66312361 is about 404.7605372000.

The spelling of 66312361 in words is "sixty-six million, three hundred twelve thousand, three hundred sixty-one".