511561666040403 has 128 divisors (see below), whose sum is σ = 805145480939520. Its totient is φ = 285463277568000.

The previous prime is 511561666040393. The next prime is 511561666040431. The reversal of 511561666040403 is 304040666165115.

It is not a de Polignac number, because 511561666040403 - 2¹³ = 511561666032211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (511561666040473) by changing a digit.

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 in 127 ways as a sum of consecutive naturals, for example, 13036387863 + ... + 13036427103.

It is an arithmetic number, because the mean of its divisors is an integer number (6290199069840).

Almost surely, 2^{511561666040403} is an apocalyptic number.

511561666040403 is a deficient number, since it is larger than the sum of its proper divisors (293583814899117).

511561666040403 is a wasteful number, since it uses less digits than its factorization.

511561666040403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41869.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 511561666040403 in words is "five hundred eleven trillion, five hundred sixty-one billion, six hundred sixty-six million, forty thousand, four hundred three".