109863367561 has 4 divisors (see below), whose sum is σ = 116325918612. Its totient is φ = 103400816512.

The previous prime is 109863367499. The next prime is 109863367597. The reversal of 109863367561 is 165763368901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165763368901 = 13 ⋅12751028377.

It can be written as a sum of positive squares in 2 ways, for example, as 101298975625 + 8564391936 = 318275^2 + 92544^2 .

It is a cyclic number.

It is not a de Polignac number, because 109863367561 - 2⁷ = 109863367433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109863367261) 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, 3231275500 + ... + 3231275533.

It is an arithmetic number, because the mean of its divisors is an integer number (29081479653).

Almost surely, 2^109863367561 is an apocalyptic number.

It is an amenable number.

109863367561 is a deficient number, since it is larger than the sum of its proper divisors (6462551051).

109863367561 is an equidigital number, since it uses as much as digits as its factorization.

109863367561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462551050.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 109863367561 in words is "one hundred nine billion, eight hundred sixty-three million, three hundred sixty-seven thousand, five hundred sixty-one".