66247414231 has 4 divisors (see below), whose sum is σ = 67863204864. Its totient is φ = 64631623600.

The previous prime is 66247414229. The next prime is 66247414273. The reversal of 66247414231 is 13241474266.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66247414231 - 2¹ = 66247414229 is a prime.

It is a super-2 number, since 2×66247414231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66247417231) 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, 807895255 + ... + 807895336.

It is an arithmetic number, because the mean of its divisors is an integer number (16965801216).

Almost surely, 2^66247414231 is an apocalyptic number.

66247414231 is a deficient number, since it is larger than the sum of its proper divisors (1615790633).

66247414231 is a wasteful number, since it uses less digits than its factorization.

66247414231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615790632.

The product of its digits is 193536, while the sum is 40.

Adding to 66247414231 its reverse (13241474266), we get a palindrome (79488888497).

The spelling of 66247414231 in words is "sixty-six billion, two hundred forty-seven million, four hundred fourteen thousand, two hundred thirty-one".