645542526032831 has 16 divisors (see below), whose sum is σ = 744659603852544. Its totient is φ = 548149651574784.

The previous prime is 645542526032779. The next prime is 645542526032857. The reversal of 645542526032831 is 138230625245546.

It is not a de Polignac number, because 645542526032831 - 2¹⁴ = 645542526016447 is a prime.

It is a super-2 number, since 2×645542526032831² (a number of 30 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 (645542526032431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 463709696 + ... + 465099738.

It is an arithmetic number, because the mean of its divisors is an integer number (46541225240784).

Almost surely, 2^{645542526032831} is an apocalyptic number.

645542526032831 is a deficient number, since it is larger than the sum of its proper divisors (99117077819713).

645542526032831 is a wasteful number, since it uses less digits than its factorization.

645542526032831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010190.

The product of its (nonzero) digits is 41472000, while the sum is 56.

The spelling of 645542526032831 in words is "six hundred forty-five trillion, five hundred forty-two billion, five hundred twenty-six million, thirty-two thousand, eight hundred thirty-one".