645250322561 has 8 divisors (see below), whose sum is σ = 694902257280. Its totient is φ = 595600858512.

The previous prime is 645250322501. The next prime is 645250322569. The reversal of 645250322561 is 165223052546.

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

It is a cyclic number.

It is not a de Polignac number, because 645250322561 - 2¹⁰ = 645250321537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645250322569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56345 + ... + 1137398.

It is an arithmetic number, because the mean of its divisors is an integer number (86862782160).

Almost surely, 2^645250322561 is an apocalyptic number.

It is an amenable number.

645250322561 is a deficient number, since it is larger than the sum of its proper divisors (49651934719).

645250322561 is a wasteful number, since it uses less digits than its factorization.

645250322561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235335.

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 645250322561 in words is "six hundred forty-five billion, two hundred fifty million, three hundred twenty-two thousand, five hundred sixty-one".