779011212121 has 16 divisors (see below), whose sum is σ = 794747180304. Its totient is φ = 763314499584.

The previous prime is 779011212107. The next prime is 779011212143. The reversal of 779011212121 is 121212110977.

It can be written as a sum of positive squares in 8 ways, for example, as 494395225 + 778516816896 = 22235^2 + 882336^2 .

It is a cyclic number.

It is not a de Polignac number, because 779011212121 - 2⁹ = 779011211609 is a prime.

It is a super-2 number, since 2×779011212121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (779011212151) 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, 187395375 + ... + 187399531.

It is an arithmetic number, because the mean of its divisors is an integer number (49671698769).

Almost surely, 2^779011212121 is an apocalyptic number.

It is an amenable number.

779011212121 is a deficient number, since it is larger than the sum of its proper divisors (15735968183).

779011212121 is a wasteful number, since it uses less digits than its factorization.

779011212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7980.

The product of its (nonzero) digits is 3528, while the sum is 34.

The spelling of 779011212121 in words is "seven hundred seventy-nine billion, eleven million, two hundred twelve thousand, one hundred twenty-one".