779640189121 has 8 divisors (see below), whose sum is σ = 813565773504. Its totient is φ = 745716953520.

The previous prime is 779640189101. The next prime is 779640189161. The reversal of 779640189121 is 121981046977.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 779640189121 - 2¹⁹ = 779639664833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (779640189101) 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 7 ways as a sum of consecutive naturals, for example, 108675 + ... + 1253431.

It is an arithmetic number, because the mean of its divisors is an integer number (101695721688).

Almost surely, 2^779640189121 is an apocalyptic number.

It is an amenable number.

779640189121 is a deficient number, since it is larger than the sum of its proper divisors (33925584383).

779640189121 is a wasteful number, since it uses less digits than its factorization.

779640189121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174391.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 779640189121 in words is "seven hundred seventy-nine billion, six hundred forty million, one hundred eighty-nine thousand, one hundred twenty-one".