1645688412044 has 12 divisors (see below), whose sum is σ = 2890905121104. Its totient is φ = 819715520304.

The previous prime is 1645688412013. The next prime is 1645688412079. The reversal of 1645688412044 is 4402148865461.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782170247 + ... + 782172350.

It is an arithmetic number, because the mean of its divisors is an integer number (240908760092).

Almost surely, 2^{1645688412044} is an apocalyptic number.

It is an amenable number.

1645688412044 is a deficient number, since it is larger than the sum of its proper divisors (1245216709060).

1645688412044 is a wasteful number, since it uses less digits than its factorization.

1645688412044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564342864 (or 1564342862 counting only the distinct ones).

The product of its (nonzero) digits is 5898240, while the sum is 53.

The spelling of 1645688412044 in words is "one trillion, six hundred forty-five billion, six hundred eighty-eight million, four hundred twelve thousand, forty-four".