5657929387721 has 4 divisors (see below), whose sum is σ = 6093154725252. Its totient is φ = 5222704050192.

The previous prime is 5657929387697. The next prime is 5657929387739. The reversal of 5657929387721 is 1277839297565.

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 512994007696 + 5144935380025 = 716236^2 + 2268245^2 .

It is a cyclic number.

It is not a de Polignac number, because 5657929387721 - 2⁴² = 1259882876617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5657929387021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217612668746 + ... + 217612668771.

It is an arithmetic number, because the mean of its divisors is an integer number (1523288681313).

Almost surely, 2^{5657929387721} is an apocalyptic number.

It is an amenable number.

5657929387721 is a deficient number, since it is larger than the sum of its proper divisors (435225337531).

5657929387721 is a wasteful number, since it uses less digits than its factorization.

5657929387721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435225337530.

The product of its digits is 400075200, while the sum is 71.

The spelling of 5657929387721 in words is "five trillion, six hundred fifty-seven billion, nine hundred twenty-nine million, three hundred eighty-seven thousand, seven hundred twenty-one".