557205206721 has 4 divisors (see below), whose sum is σ = 742940275632. Its totient is φ = 371470137812.

The previous prime is 557205206693. The next prime is 557205206731. The reversal of 557205206721 is 127602502755.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-557205206721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (557205206731) 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, 92867534451 + ... + 92867534456.

It is an arithmetic number, because the mean of its divisors is an integer number (185735068908).

Almost surely, 2^557205206721 is an apocalyptic number.

It is an amenable number.

557205206721 is a deficient number, since it is larger than the sum of its proper divisors (185735068911).

557205206721 is a wasteful number, since it uses less digits than its factorization.

557205206721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185735068910.

The product of its (nonzero) digits is 294000, while the sum is 42.

The spelling of 557205206721 in words is "five hundred fifty-seven billion, two hundred five million, two hundred six thousand, seven hundred twenty-one".