26173166420 has 48 divisors (see below), whose sum is σ = 57041001360. Its totient is φ = 10075892736.

The previous prime is 26173166413. The next prime is 26173166479. The reversal of 26173166420 is 2466137162.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5837265604 + 20335900816 = 76402^2 + 142604^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109454 + ... + 253626.

It is an arithmetic number, because the mean of its divisors is an integer number (1188354195).

Almost surely, 2^26173166420 is an apocalyptic number.

26173166420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26173166420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28520500680).

26173166420 is an abundant number, since it is smaller than the sum of its proper divisors (30867834940).

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

26173166420 is a wasteful number, since it uses less digits than its factorization.

26173166420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144524 (or 144522 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 26173166420 in words is "twenty-six billion, one hundred seventy-three million, one hundred sixty-six thousand, four hundred twenty".