501666348025 has 6 divisors (see below), whose sum is σ = 622066271582. Its totient is φ = 401333078400.

The previous prime is 501666348013. The next prime is 501666348049. The reversal of 501666348025 is 520843666105.

It can be written as a sum of positive squares in 3 ways, for example, as 5572921104 + 496093426921 = 74652^2 + 704339^2 .

It is not a de Polignac number, because 501666348025 - 2⁹ = 501666347513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10033326936 + ... + 10033326985.

Almost surely, 2^501666348025 is an apocalyptic number.

It is an amenable number.

501666348025 is a deficient number, since it is larger than the sum of its proper divisors (120399923557).

501666348025 is a wasteful number, since it uses less digits than its factorization.

501666348025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20066653931 (or 20066653926 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 501666348025 in words is "five hundred one billion, six hundred sixty-six million, three hundred forty-eight thousand, twenty-five".