501445545446666 has 4 divisors (see below), whose sum is σ = 752168318170002. Its totient is φ = 250722772723332.

The previous prime is 501445545446623. The next prime is 501445545446687. The reversal of 501445545446666 is 666644545544105.

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., 373885575326641 + 127559970120025 = 19336121^2 + 11294245^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125361386361665 + ... + 125361386361668.

Almost surely, 2^{501445545446666} is an apocalyptic number.

501445545446666 is a deficient number, since it is larger than the sum of its proper divisors (250722772723336).

501445545446666 is a wasteful number, since it uses less digits than its factorization.

501445545446666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250722772723335.

The product of its (nonzero) digits is 829440000, while the sum is 65.

The spelling of 501445545446666 in words is "five hundred one trillion, four hundred forty-five billion, five hundred forty-five million, four hundred forty-six thousand, six hundred sixty-six".