645573680142 has 16 divisors (see below), whose sum is σ = 1291776292560. Its totient is φ = 215086404672.

The previous prime is 645573680119. The next prime is 645573680161. The reversal of 645573680142 is 241086375546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26192167 + ... + 26216802.

It is an arithmetic number, because the mean of its divisors is an integer number (80736018285).

Almost surely, 2^645573680142 is an apocalyptic number.

645573680142 is an abundant number, since it is smaller than the sum of its proper divisors (646202612418).

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

645573680142 is a wasteful number, since it uses less digits than its factorization.

645573680142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52411027.

The product of its (nonzero) digits is 4838400, while the sum is 51.

The spelling of 645573680142 in words is "six hundred forty-five billion, five hundred seventy-three million, six hundred eighty thousand, one hundred forty-two".