1261818835152 has 80 divisors (see below), whose sum is σ = 3365780909568. Its totient is φ = 406925752320.

The previous prime is 1261818835129. The next prime is 1261818835159. The reversal of 1261818835152 is 2515388181621.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1261818835095 and 1261818835104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261818835159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5349988 + ... + 5580860.

Almost surely, 2^{1261818835152} is an apocalyptic number.

1261818835152 is a gapful number since it is divisible by the number (12) 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 1261818835152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1682890454784).

1261818835152 is an abundant number, since it is smaller than the sum of its proper divisors (2103962074416).

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

1261818835152 is a wasteful number, since it uses less digits than its factorization.

1261818835152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234588 (or 234582 counting only the distinct ones).

The product of its digits is 921600, while the sum is 51.

The spelling of 1261818835152 in words is "one trillion, two hundred sixty-one billion, eight hundred eighteen million, eight hundred thirty-five thousand, one hundred fifty-two".