491755367877 has 4 divisors (see below), whose sum is σ = 655673823840. Its totient is φ = 327836911916.

The previous prime is 491755367867. The next prime is 491755367881. The reversal of 491755367877 is 778763557194.

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 491755367877 - 2¹⁶ = 491755302341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491755367867) 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, 81959227977 + ... + 81959227982.

It is an arithmetic number, because the mean of its divisors is an integer number (163918455960).

Almost surely, 2^491755367877 is an apocalyptic number.

It is an amenable number.

491755367877 is a deficient number, since it is larger than the sum of its proper divisors (163918455963).

491755367877 is a wasteful number, since it uses less digits than its factorization.

491755367877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163918455962.

The product of its digits is 311169600, while the sum is 69.

The spelling of 491755367877 in words is "four hundred ninety-one billion, seven hundred fifty-five million, three hundred sixty-seven thousand, eight hundred seventy-seven".