645442656142 has 4 divisors (see below), whose sum is σ = 968163984216. Its totient is φ = 322721328070.

The previous prime is 645442656121. The next prime is 645442656161. The reversal of 645442656142 is 241656244546.

645442656142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161360664034 + ... + 161360664037.

It is an arithmetic number, because the mean of its divisors is an integer number (242040996054).

Almost surely, 2^645442656142 is an apocalyptic number.

645442656142 is a deficient number, since it is larger than the sum of its proper divisors (322721328074).

645442656142 is a wasteful number, since it uses less digits than its factorization.

645442656142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322721328073.

The product of its digits is 5529600, while the sum is 49.

The spelling of 645442656142 in words is "six hundred forty-five billion, four hundred forty-two million, six hundred fifty-six thousand, one hundred forty-two".