783420385565 has 4 divisors (see below), whose sum is σ = 940104462684. Its totient is φ = 626736308448.

The previous prime is 783420385529. The next prime is 783420385567. The reversal of 783420385565 is 565583024387.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 594050938009 + 189369447556 = 770747^2 + 435166^2 .

It is a cyclic number.

It is not a de Polignac number, because 783420385565 - 2²⁰ = 783419336989 is a prime.

It is a super-2 number, since 2×783420385565² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 783420385565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (783420385567) 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, 78342038552 + ... + 78342038561.

It is an arithmetic number, because the mean of its divisors is an integer number (235026115671).

Almost surely, 2^783420385565 is an apocalyptic number.

It is an amenable number.

783420385565 is a deficient number, since it is larger than the sum of its proper divisors (156684077119).

783420385565 is a wasteful number, since it uses less digits than its factorization.

783420385565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156684077118.

The product of its (nonzero) digits is 24192000, while the sum is 56.

The spelling of 783420385565 in words is "seven hundred eighty-three billion, four hundred twenty million, three hundred eighty-five thousand, five hundred sixty-five".