645242317743 has 8 divisors (see below), whose sum is σ = 860983358848. Its totient is φ = 429831410904.

The previous prime is 645242317673. The next prime is 645242317763. The reversal of 645242317743 is 347713242546.

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

It is not a de Polignac number, because 645242317743 - 2¹² = 645242313647 is a prime.

It is a super-2 number, since 2×645242317743² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645242317692 and 645242317701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645242317763) 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 7 ways as a sum of consecutive naturals, for example, 82529005 + ... + 82536822.

It is an arithmetic number, because the mean of its divisors is an integer number (107622919856).

Almost surely, 2^645242317743 is an apocalyptic number.

645242317743 is a deficient number, since it is larger than the sum of its proper divisors (215741041105).

645242317743 is a wasteful number, since it uses less digits than its factorization.

645242317743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165067133.

The product of its digits is 3386880, while the sum is 48.

The spelling of 645242317743 in words is "six hundred forty-five billion, two hundred forty-two million, three hundred seventeen thousand, seven hundred forty-three".