1780494688097 has 4 divisors (see below), whose sum is σ = 1780729682436. Its totient is φ = 1780259693760.

The previous prime is 1780494688081. The next prime is 1780494688111. The reversal of 1780494688097 is 7908864940871.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 336306046561 + 1444188641536 = 579919^2 + 1201744^2 .

It is a cyclic number.

It is not a de Polignac number, because 1780494688097 - 2⁴ = 1780494688081 is a prime.

It is a super-3 number, since 3×1780494688097³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1780494688097.

It is not an unprimeable number, because it can be changed into a prime (1780494688057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117485804 + ... + 117500957.

It is an arithmetic number, because the mean of its divisors is an integer number (445182420609).

Almost surely, 2^{1780494688097} is an apocalyptic number.

It is an amenable number.

1780494688097 is a deficient number, since it is larger than the sum of its proper divisors (234994339).

1780494688097 is an equidigital number, since it uses as much as digits as its factorization.

1780494688097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234994338.

The product of its (nonzero) digits is 195084288, while the sum is 71.

The spelling of 1780494688097 in words is "one trillion, seven hundred eighty billion, four hundred ninety-four million, six hundred eighty-eight thousand, ninety-seven".