645142187376 has 80 divisors (see below), whose sum is σ = 1868786119200. Its totient is φ = 213074468352.

The previous prime is 645142187311. The next prime is 645142187377. The reversal of 645142187376 is 673781241546.

645142187376 is a `hidden beast` number, since 6 + 4 + 51 + 4 + 218 + 7 + 376 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645142187377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6803301 + ... + 6897476.

It is an arithmetic number, because the mean of its divisors is an integer number (23359826490).

Almost surely, 2^645142187376 is an apocalyptic number.

It is an amenable number.

645142187376 is an abundant number, since it is smaller than the sum of its proper divisors (1223643931824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645142187376 is a wasteful number, since it uses less digits than its factorization.

645142187376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13700903 (or 13700891 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The spelling of 645142187376 in words is "six hundred forty-five billion, one hundred forty-two million, one hundred eighty-seven thousand, three hundred seventy-six".