645481522677 has 8 divisors (see below), whose sum is σ = 860671863360. Its totient is φ = 430306098560.

The previous prime is 645481522663. The next prime is 645481522687. The reversal of 645481522677 is 776225184546.

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 645481522677 - 2⁶ = 645481522613 is a prime.

It is a super-2 number, since 2×645481522677² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645481522607) 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, 3627777 + ... + 3801542.

It is an arithmetic number, because the mean of its divisors is an integer number (107583982920).

Almost surely, 2^645481522677 is an apocalyptic number.

It is an amenable number.

645481522677 is a deficient number, since it is larger than the sum of its proper divisors (215190340683).

645481522677 is a wasteful number, since it uses less digits than its factorization.

645481522677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7458283.

The product of its digits is 22579200, while the sum is 57.

The spelling of 645481522677 in words is "six hundred forty-five billion, four hundred eighty-one million, five hundred twenty-two thousand, six hundred seventy-seven".