1645034404004 has 12 divisors (see below), whose sum is σ = 2978079524700. Its totient is φ = 794154539808.

The previous prime is 1645034404001. The next prime is 1645034404087. The reversal of 1645034404004 is 4004044305461.

It can be written as a sum of positive squares in 2 ways, for example, as 1287612172900 + 357422231104 = 1134730^2 + 597848^2 .

It is a super-2 number, since 2×1645034404004² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1645034404001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7090665419 + ... + 7090665650.

It is an arithmetic number, because the mean of its divisors is an integer number (248173293725).

Almost surely, 2^{1645034404004} is an apocalyptic number.

It is an amenable number.

1645034404004 is a deficient number, since it is larger than the sum of its proper divisors (1333045120696).

1645034404004 is a wasteful number, since it uses less digits than its factorization.

1645034404004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14181331102 (or 14181331100 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 1645034404004 its reverse (4004044305461), we get a palindrome (5649078709465).

The spelling of 1645034404004 in words is "one trillion, six hundred forty-five billion, thirty-four million, four hundred four thousand, four".