123653215261 has 2 divisors, whose sum is σ = 123653215262. Its totient is φ = 123653215260.

The previous prime is 123653215247. The next prime is 123653215271. The reversal of 123653215261 is 162512356321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103629267225 + 20023948036 = 321915^2 + 141506^2 .

It is a cyclic number.

It is not a de Polignac number, because 123653215261 - 2¹⁵ = 123653182493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123653215261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123653215271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61826607630 + 61826607631.

It is an arithmetic number, because the mean of its divisors is an integer number (61826607631).

Almost surely, 2^123653215261 is an apocalyptic number.

It is an amenable number.

123653215261 is a deficient number, since it is larger than the sum of its proper divisors (1).

123653215261 is an equidigital number, since it uses as much as digits as its factorization.

123653215261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 37.

The spelling of 123653215261 in words is "one hundred twenty-three billion, six hundred fifty-three million, two hundred fifteen thousand, two hundred sixty-one".