505657133257 has 4 divisors (see below), whose sum is σ = 505672040836. Its totient is φ = 505642225680.

The previous prime is 505657133243. The next prime is 505657133347. The reversal of 505657133257 is 752331756505.

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 283216616761 + 222440516496 = 532181^2 + 471636^2 .

It is a cyclic number.

It is not a de Polignac number, because 505657133257 - 2³¹ = 503509649609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 505657133257.

It is not an unprimeable number, because it can be changed into a prime (505657133357) 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, 7402794 + ... + 7470787.

It is an arithmetic number, because the mean of its divisors is an integer number (126418010209).

Almost surely, 2^505657133257 is an apocalyptic number.

It is an amenable number.

505657133257 is a deficient number, since it is larger than the sum of its proper divisors (14907579).

505657133257 is a wasteful number, since it uses less digits than its factorization.

505657133257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14907578.

The product of its (nonzero) digits is 3307500, while the sum is 49.

The spelling of 505657133257 in words is "five hundred five billion, six hundred fifty-seven million, one hundred thirty-three thousand, two hundred fifty-seven".