57785909697 has 6 divisors (see below), whose sum is σ = 83468536242. Its totient is φ = 38523939792.

The previous prime is 57785909689. The next prime is 57785909729. The reversal of 57785909697 is 79690958775.

It can be written as a sum of positive squares in only one way, i.e., 57530900736 + 255008961 = 239856^2 + 15969^2 .

It is not a de Polignac number, because 57785909697 - 2³ = 57785909689 is a prime.

It is a super-2 number, since 2×57785909697² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (57785909897) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3210328308 + ... + 3210328325.

It is an arithmetic number, because the mean of its divisors is an integer number (13911422707).

Almost surely, 2^57785909697 is an apocalyptic number.

It is an amenable number.

57785909697 is a deficient number, since it is larger than the sum of its proper divisors (25682626545).

57785909697 is a wasteful number, since it uses less digits than its factorization.

57785909697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6420656639 (or 6420656636 counting only the distinct ones).

The product of its (nonzero) digits is 300056400, while the sum is 72.

Adding to 57785909697 its sum of digits (72), we get a square (57785909769 = 240387²).

The spelling of 57785909697 in words is "fifty-seven billion, seven hundred eighty-five million, nine hundred nine thousand, six hundred ninety-seven".