645416614493 has 4 divisors (see below), whose sum is σ = 737618988000. Its totient is φ = 553214240988.

The previous prime is 645416614433. The next prime is 645416614511. The reversal of 645416614493 is 394416614546.

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 645416614493 - 2⁶ = 645416614429 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 (645416614433) 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, 46101186743 + ... + 46101186756.

It is an arithmetic number, because the mean of its divisors is an integer number (184404747000).

Almost surely, 2^645416614493 is an apocalyptic number.

It is an amenable number.

645416614493 is a deficient number, since it is larger than the sum of its proper divisors (92202373507).

645416614493 is an equidigital number, since it uses as much as digits as its factorization.

645416614493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92202373506.

The product of its digits is 7464960, while the sum is 53.

Adding to 645416614493 its sum of digits (53), we get a palindrome (645416614546).

The spelling of 645416614493 in words is "six hundred forty-five billion, four hundred sixteen million, six hundred fourteen thousand, four hundred ninety-three".