123661352533 has 2 divisors, whose sum is σ = 123661352534. Its totient is φ = 123661352532.

The previous prime is 123661352513. The next prime is 123661352537. The reversal of 123661352533 is 335253166321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103206060049 + 20455292484 = 321257^2 + 143022^2 .

It is an emirp because it is prime and its reverse (335253166321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123661352533 is a prime.

It is a super-2 number, since 2×123661352533² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123661352537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61830676266 + 61830676267.

It is an arithmetic number, because the mean of its divisors is an integer number (61830676267).

Almost surely, 2^123661352533 is an apocalyptic number.

It is an amenable number.

123661352533 is a deficient number, since it is larger than the sum of its proper divisors (1).

123661352533 is an equidigital number, since it uses as much as digits as its factorization.

123661352533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 40.

The spelling of 123661352533 in words is "one hundred twenty-three billion, six hundred sixty-one million, three hundred fifty-two thousand, five hundred thirty-three".