645106322501 has 8 divisors (see below), whose sum is σ = 667628083200. Its totient is φ = 622691554320.

The previous prime is 645106322467. The next prime is 645106322507. The reversal of 645106322501 is 105223601546.

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 645106322501 - 2³⁴ = 627926453317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645106322507) 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, 26735861 + ... + 26759978.

It is an arithmetic number, because the mean of its divisors is an integer number (83453510400).

Almost surely, 2^645106322501 is an apocalyptic number.

It is an amenable number.

645106322501 is a deficient number, since it is larger than the sum of its proper divisors (22521760699).

645106322501 is a wasteful number, since it uses less digits than its factorization.

645106322501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53496259.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 645106322501 in words is "six hundred forty-five billion, one hundred six million, three hundred twenty-two thousand, five hundred one".