499951399125649 has 9 divisors (see below), whose sum is σ = 500288473393617. Its totient is φ = 499614551857104.

The previous prime is 499951399125631. The next prime is 499951399125697. The reversal of 499951399125649 is 946521993159994.

The square root of 499951399125649 is 22359593.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 144856269140625 + 355095129985024 = 12035625^2 + 18843968^2 .

It is not a de Polignac number, because 499951399125649 - 2⁵ = 499951399125617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (499951399195649) by changing a digit.

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 in 8 ways as a sum of consecutive naturals, for example, 37318154019 + ... + 37318167415.

Almost surely, 2^{499951399125649} is an apocalyptic number.

499951399125649 is the 22359593-rd square number.

499951399125649 is the 11179797-th centered octagonal number.

It is an amenable number.

499951399125649 is a deficient number, since it is larger than the sum of its proper divisors (337074267968).

499951399125649 is an frugal number, since it uses more digits than its factorization.

499951399125649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30132 (or 15066 counting only the distinct ones).

The product of its digits is 7652750400, while the sum is 85.

The spelling of 499951399125649 in words is "four hundred ninety-nine trillion, nine hundred fifty-one billion, three hundred ninety-nine million, one hundred twenty-five thousand, six hundred forty-nine".