645551063473 has 8 divisors (see below), whose sum is σ = 683531775360. Its totient is φ = 607571142720.

The previous prime is 645551063431. The next prime is 645551063513. The reversal of 645551063473 is 374360155546.

645551063473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 645551063473 - 2¹⁷ = 645550932401 is a prime.

It is a super-2 number, since 2×645551063473² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645551063873) 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, 2672068 + ... + 2903626.

It is an arithmetic number, because the mean of its divisors is an integer number (85441471920).

Almost surely, 2^645551063473 is an apocalyptic number.

It is an amenable number.

645551063473 is a deficient number, since it is larger than the sum of its proper divisors (37980711887).

645551063473 is a wasteful number, since it uses less digits than its factorization.

645551063473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395567.

The product of its (nonzero) digits is 4536000, while the sum is 49.

The spelling of 645551063473 in words is "six hundred forty-five billion, five hundred fifty-one million, sixty-three thousand, four hundred seventy-three".