611666728403 has 4 divisors (see below), whose sum is σ = 611834910960. Its totient is φ = 611498545848.

The previous prime is 611666728381. The next prime is 611666728427. The reversal of 611666728403 is 304827666116.

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

It is a cyclic number.

It is not a de Polignac number, because 611666728403 - 2²⁰ = 611665679827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611666728493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84085823 + ... + 84093096.

It is an arithmetic number, because the mean of its divisors is an integer number (152958727740).

Almost surely, 2^611666728403 is an apocalyptic number.

611666728403 is a deficient number, since it is larger than the sum of its proper divisors (168182557).

611666728403 is a wasteful number, since it uses less digits than its factorization.

611666728403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168182556.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 611666728403 in words is "six hundred eleven billion, six hundred sixty-six million, seven hundred twenty-eight thousand, four hundred three".