645116631151 has 16 divisors (see below), whose sum is σ = 661428633600. Its totient is φ = 628987107168.

The previous prime is 645116631149. The next prime is 645116631191. The reversal of 645116631151 is 151136611546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 645116631151 - 2¹ = 645116631149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645116631101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26835405 + ... + 26859433.

It is an arithmetic number, because the mean of its divisors is an integer number (41339289600).

Almost surely, 2^645116631151 is an apocalyptic number.

645116631151 is a deficient number, since it is larger than the sum of its proper divisors (16312002449).

645116631151 is a wasteful number, since it uses less digits than its factorization.

645116631151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27798.

The product of its digits is 64800, while the sum is 40.

The spelling of 645116631151 in words is "six hundred forty-five billion, one hundred sixteen million, six hundred thirty-one thousand, one hundred fifty-one".