645357221587 has 8 divisors (see below), whose sum is σ = 706779748080. Its totient is φ = 585617504160.

The previous prime is 645357221569. The next prime is 645357221617. The reversal of 645357221587 is 785122753546.

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

It is not a de Polignac number, because 645357221587 - 2¹¹ = 645357219539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645357221087) 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 7 ways as a sum of consecutive naturals, for example, 420701464 + ... + 420702997.

It is an arithmetic number, because the mean of its divisors is an integer number (88347468510).

Almost surely, 2^645357221587 is an apocalyptic number.

645357221587 is a deficient number, since it is larger than the sum of its proper divisors (61422526493).

645357221587 is a wasteful number, since it uses less digits than its factorization.

645357221587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841404533.

The product of its digits is 14112000, while the sum is 55.

The spelling of 645357221587 in words is "six hundred forty-five billion, three hundred fifty-seven million, two hundred twenty-one thousand, five hundred eighty-seven".