640452140463 has 4 divisors (see below), whose sum is σ = 853936187288. Its totient is φ = 426968093640.

The previous prime is 640452140459. The next prime is 640452140473. The reversal of 640452140463 is 364041254046.

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

It is not a de Polignac number, because 640452140463 - 2² = 640452140459 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 (640452140413) 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, 106742023408 + ... + 106742023413.

It is an arithmetic number, because the mean of its divisors is an integer number (213484046822).

Almost surely, 2^640452140463 is an apocalyptic number.

640452140463 is a deficient number, since it is larger than the sum of its proper divisors (213484046825).

640452140463 is a wasteful number, since it uses less digits than its factorization.

640452140463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213484046824.

The product of its (nonzero) digits is 276480, while the sum is 39.

The spelling of 640452140463 in words is "six hundred forty billion, four hundred fifty-two million, one hundred forty thousand, four hundred sixty-three".