645416645042 has 8 divisors (see below), whose sum is σ = 1042596118956. Its totient is φ = 297884605392.

The previous prime is 645416645023. The next prime is 645416645099. The reversal of 645416645042 is 240546614546.

It can be written as a sum of positive squares in 2 ways, for example, as 591513271801 + 53903373241 = 769099^2 + 232171^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12411858533 + ... + 12411858584.

Almost surely, 2^645416645042 is an apocalyptic number.

645416645042 is a deficient number, since it is larger than the sum of its proper divisors (397179473914).

645416645042 is a wasteful number, since it uses less digits than its factorization.

645416645042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24823717132.

The product of its (nonzero) digits is 2764800, while the sum is 47.

The spelling of 645416645042 in words is "six hundred forty-five billion, four hundred sixteen million, six hundred forty-five thousand, forty-two".