100623240505 has 4 divisors (see below), whose sum is σ = 120747888612. Its totient is φ = 80498592400.

The previous prime is 100623240491. The next prime is 100623240521. The reversal of 100623240505 is 505042326001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505042326001 = 342341 ⋅1475261.

It can be written as a sum of positive squares in 2 ways, for example, as 75143419129 + 25479821376 = 274123^2 + 159624^2 .

It is not a de Polignac number, because 100623240505 - 2²¹ = 100621143353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10062324046 + ... + 10062324055.

It is an arithmetic number, because the mean of its divisors is an integer number (30186972153).

Almost surely, 2^100623240505 is an apocalyptic number.

It is an amenable number.

100623240505 is a deficient number, since it is larger than the sum of its proper divisors (20124648107).

100623240505 is an equidigital number, since it uses as much as digits as its factorization.

100623240505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20124648106.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 100623240505 its reverse (505042326001), we get a palindrome (605665566506).

The spelling of 100623240505 in words is "one hundred billion, six hundred twenty-three million, two hundred forty thousand, five hundred five".