611666728386 has 32 divisors (see below), whose sum is σ = 1458882137088. Its totient is φ = 167163577680.

The previous prime is 611666728381. The next prime is 611666728427. The reversal of 611666728386 is 683827666116.

It is a super-2 number, since 2×611666728386² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (611666728381) 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 15 ways as a sum of consecutive naturals, for example, 316596720 + ... + 316598651.

It is an arithmetic number, because the mean of its divisors is an integer number (45590066784).

Almost surely, 2^611666728386 is an apocalyptic number.

611666728386 is an abundant number, since it is smaller than the sum of its proper divisors (847215408702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

611666728386 is a wasteful number, since it uses less digits than its factorization.

611666728386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633195406.

The product of its digits is 20901888, while the sum is 60.

The spelling of 611666728386 in words is "six hundred eleven billion, six hundred sixty-six million, seven hundred twenty-eight thousand, three hundred eighty-six".