780020550605 has 16 divisors (see below), whose sum is σ = 940268936880. Its totient is φ = 621188218368.

The previous prime is 780020550577. The next prime is 780020550619. The reversal of 780020550605 is 506055020087.

It can be written as a sum of positive squares in 8 ways, for example, as 48335341609 + 731685208996 = 219853^2 + 855386^2 .

It is a cyclic number.

It is not a de Polignac number, because 780020550605 - 2³⁰ = 778946808781 is a prime.

It is a super-2 number, since 2×780020550605² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4876031 + ... + 5033459.

It is an arithmetic number, because the mean of its divisors is an integer number (58766808555).

Almost surely, 2^780020550605 is an apocalyptic number.

It is an amenable number.

780020550605 is a deficient number, since it is larger than the sum of its proper divisors (160248386275).

780020550605 is a wasteful number, since it uses less digits than its factorization.

780020550605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161920.

The product of its (nonzero) digits is 84000, while the sum is 38.

The spelling of 780020550605 in words is "seven hundred eighty billion, twenty million, five hundred fifty thousand, six hundred five".