640323322451 has 8 divisors (see below), whose sum is σ = 671195407344. Its totient is φ = 610177639680.

The previous prime is 640323322433. The next prime is 640323322469. The reversal of 640323322451 is 154223323046.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (640323322433) and next prime (640323322469).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640323322451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640323322151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181598726 + ... + 181602251.

It is an arithmetic number, because the mean of its divisors is an integer number (83899425918).

Almost surely, 2^640323322451 is an apocalyptic number.

640323322451 is a deficient number, since it is larger than the sum of its proper divisors (30872084893).

640323322451 is a wasteful number, since it uses less digits than its factorization.

640323322451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363201061.

The product of its (nonzero) digits is 103680, while the sum is 35.

Adding to 640323322451 its reverse (154223323046), we get a palindrome (794546645497).

The spelling of 640323322451 in words is "six hundred forty billion, three hundred twenty-three million, three hundred twenty-two thousand, four hundred fifty-one".