491126344678 has 4 divisors (see below), whose sum is σ = 736689517020. Its totient is φ = 245563172338.

The previous prime is 491126344663. The next prime is 491126344691. The reversal of 491126344678 is 876443621194.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122781586168 + ... + 122781586171.

It is an arithmetic number, because the mean of its divisors is an integer number (184172379255).

Almost surely, 2^491126344678 is an apocalyptic number.

491126344678 is a deficient number, since it is larger than the sum of its proper divisors (245563172342).

491126344678 is a wasteful number, since it uses less digits than its factorization.

491126344678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245563172341.

The product of its digits is 6967296, while the sum is 55.

The spelling of 491126344678 in words is "four hundred ninety-one billion, one hundred twenty-six million, three hundred forty-four thousand, six hundred seventy-eight".