1261958887296 has 256 divisors, whose sum is σ = 3852460684800. Its totient is φ = 406404034560.

The previous prime is 1261958887237. The next prime is 1261958887303. The reversal of 1261958887296 is 6927888591621.

1261958887296 is a `hidden beast` number, since 1 + 2 + 6 + 19 + 588 + 8 + 7 + 29 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14551455 + ... + 14637921.

It is an arithmetic number, because the mean of its divisors is an integer number (15048674550).

Almost surely, 2^{1261958887296} is an apocalyptic number.

1261958887296 is a gapful number since it is divisible by the number (16) 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 1261958887296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1926230342400).

1261958887296 is an abundant number, since it is smaller than the sum of its proper divisors (2590501797504).

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

1261958887296 is a wasteful number, since it uses less digits than its factorization.

1261958887296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86634 (or 86616 counting only the distinct ones).

The product of its digits is 209018880, while the sum is 72.

The spelling of 1261958887296 in words is "one trillion, two hundred sixty-one billion, nine hundred fifty-eight million, eight hundred eighty-seven thousand, two hundred ninety-six".