123255217765 has 4 divisors (see below), whose sum is σ = 147906261324. Its totient is φ = 98604174208.

The previous prime is 123255217751. The next prime is 123255217769. The reversal of 123255217765 is 567712552321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 567712552321 = 1601 ⋅354598721.

It can be written as a sum of positive squares in 2 ways, for example, as 36196584516 + 87058633249 = 190254^2 + 295057^2 .

It is a cyclic number.

It is not a de Polignac number, because 123255217765 - 2¹³ = 123255209573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123255217769) 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, 12325521772 + ... + 12325521781.

It is an arithmetic number, because the mean of its divisors is an integer number (36976565331).

Almost surely, 2^123255217765 is an apocalyptic number.

It is an amenable number.

123255217765 is a deficient number, since it is larger than the sum of its proper divisors (24651043559).

123255217765 is an equidigital number, since it uses as much as digits as its factorization.

123255217765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24651043558.

The product of its digits is 882000, while the sum is 46.

The spelling of 123255217765 in words is "one hundred twenty-three billion, two hundred fifty-five million, two hundred seventeen thousand, seven hundred sixty-five".