73999169856 has 168 divisors, whose sum is σ = 216533312424. Its totient is φ = 24153292800.

The previous prime is 73999169843. The next prime is 73999169863. The reversal of 73999169856 is 65896199937.

It can be written as a sum of positive squares in 4 ways, for example, as 22615347456 + 51383822400 = 150384^2 + 226680^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17612556 + ... + 17616756.

Almost surely, 2^73999169856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73999169856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108266656212).

73999169856 is an abundant number, since it is smaller than the sum of its proper divisors (142534142568).

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

73999169856 is a wasteful number, since it uses less digits than its factorization.

73999169856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4849 (or 4836 counting only the distinct ones).

The product of its digits is 198404640, while the sum is 72.

The spelling of 73999169856 in words is "seventy-three billion, nine hundred ninety-nine million, one hundred sixty-nine thousand, eight hundred fifty-six".