100668160561 has 4 divisors (see below), whose sum is σ = 101664875124. Its totient is φ = 99671446000.

The previous prime is 100668160547. The next prime is 100668160577. The reversal of 100668160561 is 165061866001.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 69126400561 + 31541760000 = 262919^2 + 177600^2 .

It is not a de Polignac number, because 100668160561 - 2⁵ = 100668160529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100668160511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498357130 + ... + 498357331.

It is an arithmetic number, because the mean of its divisors is an integer number (25416218781).

Almost surely, 2^100668160561 is an apocalyptic number.

It is an amenable number.

100668160561 is a deficient number, since it is larger than the sum of its proper divisors (996714563).

100668160561 is an equidigital number, since it uses as much as digits as its factorization.

100668160561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996714562.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 100668160561 in words is "one hundred billion, six hundred sixty-eight million, one hundred sixty thousand, five hundred sixty-one".