1673721323730 has 192 divisors, whose sum is σ = 4464517824000. Its totient is φ = 434918854656.

The previous prime is 1673721323713. The next prime is 1673721323731. The reversal of 1673721323730 is 373231273761.

1673721323730 is a `hidden beast` number, since 1 + 6 + 7 + 372 + 13 + 237 + 30 = 666.

It is a super-2 number, since 2×1673721323730² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1673721323731) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 391694874 + ... + 391699146.

It is an arithmetic number, because the mean of its divisors is an integer number (23252697000).

Almost surely, 2^{1673721323730} is an apocalyptic number.

1673721323730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1673721323730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2232258912000).

1673721323730 is an abundant number, since it is smaller than the sum of its proper divisors (2790796500270).

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

1673721323730 is a wasteful number, since it uses less digits than its factorization.

1673721323730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5073 (or 5070 counting only the distinct ones).

The product of its (nonzero) digits is 666792, while the sum is 45.

The spelling of 1673721323730 in words is "one trillion, six hundred seventy-three billion, seven hundred twenty-one million, three hundred twenty-three thousand, seven hundred thirty".