105023615561 has 4 divisors (see below), whose sum is σ = 105027464724. Its totient is φ = 105019766400.

The previous prime is 105023615549. The next prime is 105023615633. The reversal of 105023615561 is 165516320501.

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 100010267536 + 5013348025 = 316244^2 + 70805^2 .

It is a cyclic number.

It is not a de Polignac number, because 105023615561 - 2¹⁸ = 105023353417 is a prime.

It is a super-2 number, since 2×105023615561² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105023615161) 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, 1883360 + ... + 1938321.

It is an arithmetic number, because the mean of its divisors is an integer number (26256866181).

Almost surely, 2^105023615561 is an apocalyptic number.

It is an amenable number.

105023615561 is a deficient number, since it is larger than the sum of its proper divisors (3849163).

105023615561 is an equidigital number, since it uses as much as digits as its factorization.

105023615561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3849162.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 105023615561 in words is "one hundred five billion, twenty-three million, six hundred fifteen thousand, five hundred sixty-one".