61685843351573 has 24 divisors (see below), whose sum is σ = 72842947041240. Its totient is φ = 52078834483200.

The previous prime is 61685843351557. The next prime is 61685843351579. The reversal of 61685843351573 is 37515334858616.

It can be written as a sum of positive squares in 4 ways, for example, as 2321545890244 + 59364297461329 = 1523662^2 + 7704823^2 .

It is not a de Polignac number, because 61685843351573 - 2⁴ = 61685843351557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61685843351579) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31335788 + ... + 33246101.

It is an arithmetic number, because the mean of its divisors is an integer number (3035122793385).

Almost surely, 2^{61685843351573} is an apocalyptic number.

It is an amenable number.

61685843351573 is a deficient number, since it is larger than the sum of its proper divisors (11157103689667).

61685843351573 is a wasteful number, since it uses less digits than its factorization.

61685843351573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64582197 (or 64582190 counting only the distinct ones).

The product of its digits is 217728000, while the sum is 65.

The spelling of 61685843351573 in words is "sixty-one trillion, six hundred eighty-five billion, eight hundred forty-three million, three hundred fifty-one thousand, five hundred seventy-three".