1673321378625 has 160 divisors (see below), whose sum is σ = 3450341774880. Its totient is φ = 801522086400.

The previous prime is 1673321378479. The next prime is 1673321378647. The reversal of 1673321378625 is 5268731233761.

1673321378625 is a `hidden beast` number, since 1 + 6 + 7 + 3 + 3 + 2 + 1 + 3 + 7 + 8 + 625 = 666.

It can be written as a sum of positive squares in 16 ways, for example, as 1544710922496 + 128610456129 = 1242864^2 + 358623^2 .

It is not a de Polignac number, because 1673321378625 - 2¹⁰ = 1673321377601 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 4698331 + ... + 5041919.

It is an arithmetic number, because the mean of its divisors is an integer number (21564636093).

Almost surely, 2^{1673321378625} is an apocalyptic number.

1673321378625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1673321378625 is an abundant number, since it is smaller than the sum of its proper divisors (1777020396255).

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

1673321378625 is a wasteful number, since it uses less digits than its factorization.

1673321378625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343666 (or 343647 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The spelling of 1673321378625 in words is "one trillion, six hundred seventy-three billion, three hundred twenty-one million, three hundred seventy-eight thousand, six hundred twenty-five".