640011453 has 4 divisors (see below), whose sum is σ = 853348608. Its totient is φ = 426674300.

The previous prime is 640011443. The next prime is 640011467. The reversal of 640011453 is 354110046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640011453 - 2⁶ = 640011389 is a prime.

It is a super-2 number, since 2×640011453² = 819229319942342418, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640011413) 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, 106668573 + ... + 106668578.

It is an arithmetic number, because the mean of its divisors is an integer number (213337152).

Almost surely, 2^640011453 is an apocalyptic number.

It is an amenable number.

640011453 is a deficient number, since it is larger than the sum of its proper divisors (213337155).

640011453 is a wasteful number, since it uses less digits than its factorization.

640011453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213337154.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 640011453 is about 25298.4476401221. The cubic root of 640011453 is about 861.7790165530.

Adding to 640011453 its reverse (354110046), we get a palindrome (994121499).

The spelling of 640011453 in words is "six hundred forty million, eleven thousand, four hundred fifty-three".