57721354643 has 4 divisors (see below), whose sum is σ = 57729108888. Its totient is φ = 57713600400.

The previous prime is 57721354637. The next prime is 57721354667. The reversal of 57721354643 is 34645312775.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57721354643 - 2¹⁶ = 57721289107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57721354633) 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, 3865946 + ... + 3880847.

It is an arithmetic number, because the mean of its divisors is an integer number (14432277222).

Almost surely, 2^57721354643 is an apocalyptic number.

57721354643 is a deficient number, since it is larger than the sum of its proper divisors (7754245).

57721354643 is an equidigital number, since it uses as much as digits as its factorization.

57721354643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7754244.

The product of its digits is 2116800, while the sum is 47.

The spelling of 57721354643 in words is "fifty-seven billion, seven hundred twenty-one million, three hundred fifty-four thousand, six hundred forty-three".