645026365533 has 16 divisors (see below), whose sum is σ = 941559043392. Its totient is φ = 389533872000.

The previous prime is 645026365531. The next prime is 645026365649. The reversal of 645026365533 is 335563620546.

It is a happy number.

It is not a de Polignac number, because 645026365533 - 2¹ = 645026365531 is a prime.

It is a super-2 number, since 2×645026365533² (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 (645026365531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34770538 + ... + 34789083.

It is an arithmetic number, because the mean of its divisors is an integer number (58847440212).

Almost surely, 2^645026365533 is an apocalyptic number.

It is an amenable number.

645026365533 is a deficient number, since it is larger than the sum of its proper divisors (296532677859).

645026365533 is a wasteful number, since it uses less digits than its factorization.

645026365533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69559916.

The product of its (nonzero) digits is 5832000, while the sum is 48.

The spelling of 645026365533 in words is "six hundred forty-five billion, twenty-six million, three hundred sixty-five thousand, five hundred thirty-three".