100544311661 has 4 divisors (see below), whose sum is σ = 100544959452. Its totient is φ = 100543663872.

The previous prime is 100544311619. The next prime is 100544311727. The reversal of 100544311661 is 166113445001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 55098172900 + 45446138761 = 234730^2 + 213181^2 .

It is a cyclic number.

It is not a de Polignac number, because 100544311661 - 2¹⁸ = 100544049517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100544310661) 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, 62861 + ... + 452813.

It is an arithmetic number, because the mean of its divisors is an integer number (25136239863).

Almost surely, 2^100544311661 is an apocalyptic number.

It is an amenable number.

100544311661 is a deficient number, since it is larger than the sum of its proper divisors (647791).

100544311661 is an equidigital number, since it uses as much as digits as its factorization.

100544311661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647790.

The product of its (nonzero) digits is 8640, while the sum is 32.

Adding to 100544311661 its reverse (166113445001), we get a palindrome (266657756662).

The spelling of 100544311661 in words is "one hundred billion, five hundred forty-four million, three hundred eleven thousand, six hundred sixty-one".