64186268093 has 4 divisors (see below), whose sum is σ = 67961930940. Its totient is φ = 60410605248.

The previous prime is 64186268077. The next prime is 64186268099. The reversal of 64186268093 is 39086268146.

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 42447124729 + 21739143364 = 206027^2 + 147442^2 .

It is a cyclic number.

It is not a de Polignac number, because 64186268093 - 2⁴ = 64186268077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64186268099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887831398 + ... + 1887831431.

It is an arithmetic number, because the mean of its divisors is an integer number (16990482735).

Almost surely, 2^64186268093 is an apocalyptic number.

It is an amenable number.

64186268093 is a deficient number, since it is larger than the sum of its proper divisors (3775662847).

64186268093 is a wasteful number, since it uses less digits than its factorization.

64186268093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3775662846.

The product of its (nonzero) digits is 2985984, while the sum is 53.

Adding to 64186268093 its sum of digits (53), we get a palindrome (64186268146).

The spelling of 64186268093 in words is "sixty-four billion, one hundred eighty-six million, two hundred sixty-eight thousand, ninety-three".