645442543350 has 144 divisors (see below), whose sum is σ = 1904431791600. Its totient is φ = 155420601600.

The previous prime is 645442543321. The next prime is 645442543367. The reversal of 645442543350 is 53345244546.

645442543350 is a `hidden beast` number, since 6 + 4 + 5 + 44 + 254 + 3 + 350 = 666.

It is a super-2 number, since 2×645442543350² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 645442543296 and 645442543305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 299992 + ... + 1175108.

It is an arithmetic number, because the mean of its divisors is an integer number (13225220775).

Almost surely, 2^645442543350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645442543350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (952215895800).

645442543350 is an abundant number, since it is smaller than the sum of its proper divisors (1258989248250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645442543350 is a wasteful number, since it uses less digits than its factorization.

645442543350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875295 (or 875287 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 45.

Adding to 645442543350 its reverse (53345244546), we get a palindrome (698787787896).

The spelling of 645442543350 in words is "six hundred forty-five billion, four hundred forty-two million, five hundred forty-three thousand, three hundred fifty".