645011215150231 has 16 divisors (see below), whose sum is σ = 679033365728256. Its totient is φ = 611487599538816.

The previous prime is 645011215150121. The next prime is 645011215150241. The reversal of 645011215150231 is 132051512110546.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645011215150231 is a prime.

It is a super-3 number, since 3×645011215150231³ (a number of 45 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645011215150241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76738006 + ... + 84727468.

It is an arithmetic number, because the mean of its divisors is an integer number (42439585358016).

Almost surely, 2^{645011215150231} is an apocalyptic number.

645011215150231 is a deficient number, since it is larger than the sum of its proper divisors (34022150578025).

645011215150231 is a wasteful number, since it uses less digits than its factorization.

645011215150231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8020662.

The product of its (nonzero) digits is 36000, while the sum is 37.

Adding to 645011215150231 its reverse (132051512110546), we get a palindrome (777062727260777).

The spelling of 645011215150231 in words is "six hundred forty-five trillion, eleven billion, two hundred fifteen million, one hundred fifty thousand, two hundred thirty-one".