105240420661 has 4 divisors (see below), whose sum is σ = 106008599052. Its totient is φ = 104472242272.

The previous prime is 105240420629. The next prime is 105240420679. The reversal of 105240420661 is 166024042501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166024042501 = 101 ⋅1643802401.

It can be written as a sum of positive squares in 2 ways, for example, as 89406980100 + 15833440561 = 299010^2 + 125831^2 .

It is a cyclic number.

It is not a de Polignac number, because 105240420661 - 2⁵ = 105240420629 is a prime.

It is a super-2 number, since 2×105240420661² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105240423661) 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, 384088990 + ... + 384089263.

It is an arithmetic number, because the mean of its divisors is an integer number (26502149763).

Almost surely, 2^105240420661 is an apocalyptic number.

It is an amenable number.

105240420661 is a deficient number, since it is larger than the sum of its proper divisors (768178391).

105240420661 is an equidigital number, since it uses as much as digits as its factorization.

105240420661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768178390.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 105240420661 in words is "one hundred five billion, two hundred forty million, four hundred twenty thousand, six hundred sixty-one".