778659464881 has 4 divisors (see below), whose sum is σ = 819641542000. Its totient is φ = 737677387764.

The previous prime is 778659464831. The next prime is 778659464897. The reversal of 778659464881 is 188464956877.

778659464881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 778659464881 - 2⁹ = 778659464369 is a prime.

It is a super-2 number, since 2×778659464881² (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 (778659464831) 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, 20491038531 + ... + 20491038568.

It is an arithmetic number, because the mean of its divisors is an integer number (204910385500).

Almost surely, 2^778659464881 is an apocalyptic number.

It is an amenable number.

778659464881 is a deficient number, since it is larger than the sum of its proper divisors (40982077119).

778659464881 is a wasteful number, since it uses less digits than its factorization.

778659464881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40982077118.

The product of its digits is 650280960, while the sum is 73.

The spelling of 778659464881 in words is "seven hundred seventy-eight billion, six hundred fifty-nine million, four hundred sixty-four thousand, eight hundred eighty-one".