778213282261 has 4 divisors (see below), whose sum is σ = 778216124224. Its totient is φ = 778210440300.

The previous prime is 778213282247. The next prime is 778213282267. The reversal of 778213282261 is 162282312877.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 778213282261 - 2⁹ = 778213281749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778213282267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960495 + ... + 1574476.

It is an arithmetic number, because the mean of its divisors is an integer number (194554031056).

Almost surely, 2^778213282261 is an apocalyptic number.

It is an amenable number.

778213282261 is a deficient number, since it is larger than the sum of its proper divisors (2841963).

778213282261 is a wasteful number, since it uses less digits than its factorization.

778213282261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2841962.

The product of its digits is 903168, while the sum is 49.

The spelling of 778213282261 in words is "seven hundred seventy-eight billion, two hundred thirteen million, two hundred eighty-two thousand, two hundred sixty-one".