645012753747 has 16 divisors (see below), whose sum is σ = 910643099040. Its totient is φ = 404697503232.

The previous prime is 645012753689. The next prime is 645012753793. The reversal of 645012753747 is 747357210546.

It is not a de Polignac number, because 645012753747 - 2¹⁸ = 645012491603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 645012753747.

It is not an unprimeable number, because it can be changed into a prime (645012753647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1084533 + ... + 1570425.

It is an arithmetic number, because the mean of its divisors is an integer number (56915193690).

Almost surely, 2^645012753747 is an apocalyptic number.

645012753747 is a deficient number, since it is larger than the sum of its proper divisors (265630345293).

645012753747 is a wasteful number, since it uses less digits than its factorization.

645012753747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511942.

The product of its (nonzero) digits is 4939200, while the sum is 51.

The spelling of 645012753747 in words is "six hundred forty-five billion, twelve million, seven hundred fifty-three thousand, seven hundred forty-seven".