1306261122656 has 96 divisors (see below), whose sum is σ = 3112338261312. Its totient is φ = 526833745920.

The previous prime is 1306261122653. The next prime is 1306261122659. The reversal of 1306261122656 is 6562211626031.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1306261122653) and next prime (1306261122659).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306261122653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47285360 + ... + 47312976.

It is an arithmetic number, because the mean of its divisors is an integer number (32420190222).

Almost surely, 2^{1306261122656} is an apocalyptic number.

1306261122656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1306261122656 is an abundant number, since it is smaller than the sum of its proper divisors (1806077138656).

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

1306261122656 is a wasteful number, since it uses less digits than its factorization.

1306261122656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40072 (or 40064 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

Adding to 1306261122656 its reverse (6562211626031), we get a palindrome (7868472748687).

The spelling of 1306261122656 in words is "one trillion, three hundred six billion, two hundred sixty-one million, one hundred twenty-two thousand, six hundred fifty-six".