785561605601 has 4 divisors (see below), whose sum is σ = 804721644804. Its totient is φ = 766401566400.

The previous prime is 785561605567. The next prime is 785561605603. The reversal of 785561605601 is 106506165587.

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 120808380625 + 664753224976 = 347575^2 + 815324^2 .

It is a cyclic number.

It is not a de Polignac number, because 785561605601 - 2⁶ = 785561605537 is a prime.

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 785561605601.

It is not an unprimeable number, because it can be changed into a prime (785561605603) 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, 9580019540 + ... + 9580019621.

It is an arithmetic number, because the mean of its divisors is an integer number (201180411201).

Almost surely, 2^785561605601 is an apocalyptic number.

It is an amenable number.

785561605601 is a deficient number, since it is larger than the sum of its proper divisors (19160039203).

785561605601 is a wasteful number, since it uses less digits than its factorization.

785561605601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19160039202.

The product of its (nonzero) digits is 1512000, while the sum is 50.

The spelling of 785561605601 in words is "seven hundred eighty-five billion, five hundred sixty-one million, six hundred five thousand, six hundred one".