491216258553 has 4 divisors (see below), whose sum is σ = 654955011408. Its totient is φ = 327477505700.

The previous prime is 491216258549. The next prime is 491216258609. The reversal of 491216258553 is 355852612194.

It is a happy number.

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 491216258553 - 2² = 491216258549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491216258496 and 491216258505.

It is not an unprimeable number, because it can be changed into a prime (491216254553) 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, 81869376423 + ... + 81869376428.

It is an arithmetic number, because the mean of its divisors is an integer number (163738752852).

Almost surely, 2^491216258553 is an apocalyptic number.

It is an amenable number.

491216258553 is a deficient number, since it is larger than the sum of its proper divisors (163738752855).

491216258553 is a wasteful number, since it uses less digits than its factorization.

491216258553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163738752854.

The product of its digits is 2592000, while the sum is 51.

The spelling of 491216258553 in words is "four hundred ninety-one billion, two hundred sixteen million, two hundred fifty-eight thousand, five hundred fifty-three".