778381727345 has 8 divisors (see below), whose sum is σ = 944553107880. Its totient is φ = 615708691840.

The previous prime is 778381727317. The next prime is 778381727353. The reversal of 778381727345 is 543727183877.

It can be written as a sum of positive squares in 4 ways, for example, as 37269074704 + 741112652641 = 193052^2 + 860879^2 .

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

It is not a de Polignac number, because 778381727345 - 2⁶ = 778381727281 is a prime.

It is a super-3 number, since 3×778381727345³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 874585766 + ... + 874586655.

It is an arithmetic number, because the mean of its divisors is an integer number (118069138485).

Almost surely, 2^778381727345 is an apocalyptic number.

It is an amenable number.

778381727345 is a deficient number, since it is larger than the sum of its proper divisors (166171380535).

778381727345 is a wasteful number, since it uses less digits than its factorization.

778381727345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749172515.

The product of its digits is 55319040, while the sum is 62.

The spelling of 778381727345 in words is "seven hundred seventy-eight billion, three hundred eighty-one million, seven hundred twenty-seven thousand, three hundred forty-five".