1245044771838 has 192 divisors, whose sum is σ = 3278356623360. Its totient is φ = 333572649984.

The previous prime is 1245044771807. The next prime is 1245044771849. The reversal of 1245044771838 is 8381774405421.

1245044771838 is a `hidden beast` number, since 1 + 2 + 4 + 50 + 447 + 71 + 83 + 8 = 666.

It is a super-2 number, since 2×1245044771838² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 233457820 + ... + 233463152.

It is an arithmetic number, because the mean of its divisors is an integer number (17074774080).

Almost surely, 2^{1245044771838} is an apocalyptic number.

1245044771838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1245044771838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1639178311680).

1245044771838 is an abundant number, since it is smaller than the sum of its proper divisors (2033311851522).

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

1245044771838 is a wasteful number, since it uses less digits than its factorization.

1245044771838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6343 (or 6340 counting only the distinct ones).

The product of its (nonzero) digits is 6021120, while the sum is 54.

The spelling of 1245044771838 in words is "one trillion, two hundred forty-five billion, forty-four million, seven hundred seventy-one thousand, eight hundred thirty-eight".