1281165836990 has 64 divisors (see below), whose sum is σ = 2587612305600. Its totient is φ = 453447880704.

The previous prime is 1281165836939. The next prime is 1281165836999. The reversal of 1281165836990 is 996385611821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281165836999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 698387 + ... + 1746446.

It is an arithmetic number, because the mean of its divisors is an integer number (40431442275).

Almost surely, 2^{1281165836990} is an apocalyptic number.

1281165836990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1281165836990 is an abundant number, since it is smaller than the sum of its proper divisors (1306446468610).

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

1281165836990 is a wasteful number, since it uses less digits than its factorization.

1281165836990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445021.

The product of its (nonzero) digits is 5598720, while the sum is 59.

The spelling of 1281165836990 in words is "one trillion, two hundred eighty-one billion, one hundred sixty-five million, eight hundred thirty-six thousand, nine hundred ninety".