645065190893 has 8 divisors (see below), whose sum is σ = 683087424768. Its totient is φ = 607051537344.

The previous prime is 645065190883. The next prime is 645065190947. The reversal of 645065190893 is 398091560546.

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 645065190893 - 2¹² = 645065186797 is a prime.

It is a super-2 number, since 2×645065190893² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645065190853) 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, 1989971 + ... + 2291312.

It is an arithmetic number, because the mean of its divisors is an integer number (85385928096).

Almost surely, 2^645065190893 is an apocalyptic number.

It is an amenable number.

645065190893 is a deficient number, since it is larger than the sum of its proper divisors (38022233875).

645065190893 is a wasteful number, since it uses less digits than its factorization.

645065190893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290163.

The product of its (nonzero) digits is 6998400, while the sum is 56.

The spelling of 645065190893 in words is "six hundred forty-five billion, sixty-five million, one hundred ninety thousand, eight hundred ninety-three".