491790846883855 has 4 divisors (see below), whose sum is σ = 590149016260632. Its totient is φ = 393432677507080.

The previous prime is 491790846883781. The next prime is 491790846883883. The reversal of 491790846883855 is 558388648097194.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-491790846883855 is a prime.

It is a super-2 number, since 2×491790846883855² (a number of 30 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (85) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49179084688381 + ... + 49179084688390.

It is an arithmetic number, because the mean of its divisors is an integer number (147537254065158).

Almost surely, 2^{491790846883855} is an apocalyptic number.

491790846883855 is a deficient number, since it is larger than the sum of its proper divisors (98358169376777).

491790846883855 is an equidigital number, since it uses as much as digits as its factorization.

491790846883855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98358169376776.

The product of its (nonzero) digits is 16721510400, while the sum is 85.

The spelling of 491790846883855 in words is "four hundred ninety-one trillion, seven hundred ninety billion, eight hundred forty-six million, eight hundred eighty-three thousand, eight hundred fifty-five".