645121413635 has 8 divisors (see below), whose sum is σ = 774261956976. Its totient is φ = 516019623840.

The previous prime is 645121413617. The next prime is 645121413649. The reversal of 645121413635 is 536314121546.

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

It is not a de Polignac number, because 645121413635 - 2¹⁴ = 645121397251 is a prime.

It is a super-3 number, since 3×645121413635³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645121413592 and 645121413601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9651749 + ... + 9718358.

It is an arithmetic number, because the mean of its divisors is an integer number (96782744622).

Almost surely, 2^645121413635 is an apocalyptic number.

645121413635 is a deficient number, since it is larger than the sum of its proper divisors (129140543341).

645121413635 is a wasteful number, since it uses less digits than its factorization.

645121413635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19376773.

The product of its digits is 259200, while the sum is 41.

The spelling of 645121413635 in words is "six hundred forty-five billion, one hundred twenty-one million, four hundred thirteen thousand, six hundred thirty-five".