664214157423 has 40 divisors (see below), whose sum is σ = 1017253613376. Its totient is φ = 431655609600.

The previous prime is 664214157421. The next prime is 664214157437. The reversal of 664214157423 is 324751412466.

664214157423 is a `hidden beast` number, since 6 + 6 + 4 + 214 + 1 + 5 + 7 + 423 = 666.

It is not a de Polignac number, because 664214157423 - 2¹ = 664214157421 is a prime.

It is a super-2 number, since 2×664214157423² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664214157421) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4006915 + ... + 4169387.

Almost surely, 2^664214157423 is an apocalyptic number.

664214157423 is a deficient number, since it is larger than the sum of its proper divisors (353039455953).

664214157423 is a wasteful number, since it uses less digits than its factorization.

664214157423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163757 (or 163748 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

Adding to 664214157423 its reverse (324751412466), we get a palindrome (988965569889).

The spelling of 664214157423 in words is "six hundred sixty-four billion, two hundred fourteen million, one hundred fifty-seven thousand, four hundred twenty-three".