611666100661 has 12 divisors (see below), whose sum is σ = 768373945696. Its totient is φ = 476622934920.

The previous prime is 611666100659. The next prime is 611666100667. The reversal of 611666100661 is 166001666116.

It is not a de Polignac number, because 611666100661 - 2¹ = 611666100659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611666100667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 361077135 + ... + 361078828.

Almost surely, 2^611666100661 is an apocalyptic number.

It is an amenable number.

611666100661 is a deficient number, since it is larger than the sum of its proper divisors (156707845035).

611666100661 is a wasteful number, since it uses less digits than its factorization.

611666100661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722155992 (or 722155981 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

Adding to 611666100661 its reverse (166001666116), we get a palindrome (777667766777).

The spelling of 611666100661 in words is "six hundred eleven billion, six hundred sixty-six million, one hundred thousand, six hundred sixty-one".