645120344446 has 8 divisors (see below), whose sum is σ = 968030246880. Its totient is φ = 322443595488.

The previous prime is 645120344431. The next prime is 645120344447. The reversal of 645120344446 is 644443021546.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645120344447) 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 3 ways as a sum of consecutive naturals, for example, 58281451 + ... + 58292518.

It is an arithmetic number, because the mean of its divisors is an integer number (121003780860).

Almost surely, 2^645120344446 is an apocalyptic number.

645120344446 is a deficient number, since it is larger than the sum of its proper divisors (322909902434).

645120344446 is a wasteful number, since it uses less digits than its factorization.

645120344446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116576738.

The product of its (nonzero) digits is 1105920, while the sum is 43.

The spelling of 645120344446 in words is "six hundred forty-five billion, one hundred twenty million, three hundred forty-four thousand, four hundred forty-six".