1101600508561 has 4 divisors (see below), whose sum is σ = 1258972009792. Its totient is φ = 944229007332.

The previous prime is 1101600508537. The next prime is 1101600508579. The reversal of 1101600508561 is 1658050061011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1101600508561 - 2¹⁵ = 1101600475793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1101600508501) 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, 78685750605 + ... + 78685750618.

It is an arithmetic number, because the mean of its divisors is an integer number (314743002448).

Almost surely, 2^{1101600508561} is an apocalyptic number.

It is an amenable number.

1101600508561 is a deficient number, since it is larger than the sum of its proper divisors (157371501231).

1101600508561 is an equidigital number, since it uses as much as digits as its factorization.

1101600508561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157371501230.

The product of its (nonzero) digits is 7200, while the sum is 34.

Adding to 1101600508561 its reverse (1658050061011), we get a palindrome (2759650569572).

It can be divided in two parts, 1101600 and 508561, that added together give a palindrome (1610161).

The spelling of 1101600508561 in words is "one trillion, one hundred one billion, six hundred million, five hundred eight thousand, five hundred sixty-one".