1210797997578 has 96 divisors (see below), whose sum is σ = 2833983249552. Its totient is φ = 371395584000.

The previous prime is 1210797997499. The next prime is 1210797997597. The reversal of 1210797997578 is 8757997970121.

It can be written as a sum of positive squares in 8 ways, for example, as 564666582249 + 646131415329 = 751443^2 + 803823^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 214032526 + ... + 214038182.

Almost surely, 2^{1210797997578} is an apocalyptic number.

1210797997578 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 1210797997578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1416991624776).

1210797997578 is an abundant number, since it is smaller than the sum of its proper divisors (1623185251974).

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

1210797997578 is a wasteful number, since it uses less digits than its factorization.

1210797997578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8360 (or 8357 counting only the distinct ones).

The product of its (nonzero) digits is 140026320, while the sum is 72.

The spelling of 1210797997578 in words is "one trillion, two hundred ten billion, seven hundred ninety-seven million, nine hundred ninety-seven thousand, five hundred seventy-eight".