57657971749 has 20 divisors (see below), whose sum is σ = 71220365964. Its totient is φ = 46513961088.

The previous prime is 57657971741. The next prime is 57657971753. The reversal of 57657971749 is 94717975675.

It can be written as a sum of positive squares in 2 ways, for example, as 35220028900 + 22437942849 = 187670^2 + 149793^2 .

It is not a de Polignac number, because 57657971749 - 2³ = 57657971741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57657971741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 665482 + ... + 747115.

Almost surely, 2^57657971749 is an apocalyptic number.

It is an amenable number.

57657971749 is a deficient number, since it is larger than the sum of its proper divisors (13562394215).

57657971749 is an equidigital number, since it uses as much as digits as its factorization.

57657971749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412642 (or 1412621 counting only the distinct ones).

The product of its digits is 116688600, while the sum is 67.

The spelling of 57657971749 in words is "fifty-seven billion, six hundred fifty-seven million, nine hundred seventy-one thousand, seven hundred forty-nine".