1491579421718 has 4 divisors (see below), whose sum is σ = 2237369132580. Its totient is φ = 745789710858.

The previous prime is 1491579421697. The next prime is 1491579421733. The reversal of 1491579421718 is 8171249751941.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372894855428 + ... + 372894855431.

It is an arithmetic number, because the mean of its divisors is an integer number (559342283145).

Almost surely, 2^{1491579421718} is an apocalyptic number.

1491579421718 is a deficient number, since it is larger than the sum of its proper divisors (745789710862).

1491579421718 is an equidigital number, since it uses as much as digits as its factorization.

1491579421718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745789710861.

The product of its digits is 5080320, while the sum is 59.

The spelling of 1491579421718 in words is "one trillion, four hundred ninety-one billion, five hundred seventy-nine million, four hundred twenty-one thousand, seven hundred eighteen".