492557636521 has 4 divisors (see below), whose sum is σ = 492560114832. Its totient is φ = 492555158212.

The previous prime is 492557636513. The next prime is 492557636539. The reversal of 492557636521 is 125636755294.

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 not a de Polignac number, because 492557636521 - 2³ = 492557636513 is a prime.

It is a super-2 number, since 2×492557636521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (492557636561) 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, 912295 + ... + 1348108.

It is an arithmetic number, because the mean of its divisors is an integer number (123140028708).

Almost surely, 2^492557636521 is an apocalyptic number.

It is an amenable number.

492557636521 is a deficient number, since it is larger than the sum of its proper divisors (2478311).

492557636521 is a wasteful number, since it uses less digits than its factorization.

492557636521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478310.

The product of its digits is 13608000, while the sum is 55.

The spelling of 492557636521 in words is "four hundred ninety-two billion, five hundred fifty-seven million, six hundred thirty-six thousand, five hundred twenty-one".