501449668418 has 4 divisors (see below), whose sum is σ = 752174502630. Its totient is φ = 250724834208.

The previous prime is 501449668373. The next prime is 501449668427. The reversal of 501449668418 is 814866944105.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 414603346609 + 86846321809 = 643897^2 + 294697^2 .

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, 125362417103 + ... + 125362417106.

Almost surely, 2^501449668418 is an apocalyptic number.

501449668418 is a deficient number, since it is larger than the sum of its proper divisors (250724834212).

501449668418 is a wasteful number, since it uses less digits than its factorization.

501449668418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250724834211.

The product of its (nonzero) digits is 6635520, while the sum is 56.

The spelling of 501449668418 in words is "five hundred one billion, four hundred forty-nine million, six hundred sixty-eight thousand, four hundred eighteen".