780640344122 has 4 divisors (see below), whose sum is σ = 1170960516186. Its totient is φ = 390320172060.

The previous prime is 780640344079. The next prime is 780640344137. The reversal of 780640344122 is 221443046087.

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

It can be written as a sum of positive squares in only one way, i.e., 554966891521 + 225673452601 = 744961^2 + 475051^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 780640344122.

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 as a sum of consecutive naturals, namely, 195160086029 + ... + 195160086032.

Almost surely, 2^780640344122 is an apocalyptic number.

780640344122 is a deficient number, since it is larger than the sum of its proper divisors (390320172064).

780640344122 is a wasteful number, since it uses less digits than its factorization.

780640344122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390320172063.

The product of its (nonzero) digits is 258048, while the sum is 41.

The spelling of 780640344122 in words is "seven hundred eighty billion, six hundred forty million, three hundred forty-four thousand, one hundred twenty-two".