645751343157547 has 8 divisors (see below), whose sum is σ = 704456319823920. Its totient is φ = 587046418008960.

The previous prime is 645751343157539. The next prime is 645751343157559. The reversal of 645751343157547 is 745751343157546.

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

It is a cyclic number.

It is not a de Polignac number, because 645751343157547 - 2³ = 645751343157539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645751343157247) 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, 16179783 + ... + 39411775.

It is an arithmetic number, because the mean of its divisors is an integer number (88057039977990).

Almost surely, 2^{645751343157547} is an apocalyptic number.

645751343157547 is a deficient number, since it is larger than the sum of its proper divisors (58704976666373).

645751343157547 is a wasteful number, since it uses less digits than its factorization.

645751343157547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25758893.

The product of its digits is 740880000, while the sum is 67.

Subtracting 645751343157547 from its reverse (745751343157546), we obtain a palindrome (99999999999999).

The spelling of 645751343157547 in words is "six hundred forty-five trillion, seven hundred fifty-one billion, three hundred forty-three million, one hundred fifty-seven thousand, five hundred forty-seven".