126818813550 has 192 divisors, whose sum is σ = 369811330560. Its totient is φ = 28354752000.

The previous prime is 126818813549. The next prime is 126818813617. The reversal of 126818813550 is 55318818621.

It is a super-2 number, since 2×126818813550² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 126818813550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 39273336 + ... + 39276564.

It is an arithmetic number, because the mean of its divisors is an integer number (1926100680).

Almost surely, 2^126818813550 is an apocalyptic number.

126818813550 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 126818813550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184905665280).

126818813550 is an abundant number, since it is smaller than the sum of its proper divisors (242992517010).

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

126818813550 is a wasteful number, since it uses less digits than its factorization.

126818813550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5099 (or 5094 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 48.

The spelling of 126818813550 in words is "one hundred twenty-six billion, eight hundred eighteen million, eight hundred thirteen thousand, five hundred fifty".