123315405154477 has 2 divisors, whose sum is σ = 123315405154478. Its totient is φ = 123315405154476.

The previous prime is 123315405154457. The next prime is 123315405154541. The reversal of 123315405154477 is 774451504513321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61848331225641 + 61467073928836 = 7864371^2 + 7840094^2 .

It is a cyclic number.

It is not a de Polignac number, because 123315405154477 - 2¹⁹ = 123315404630189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123315405154457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61657702577238 + 61657702577239.

It is an arithmetic number, because the mean of its divisors is an integer number (61657702577239).

Almost surely, 2^{123315405154477} is an apocalyptic number.

It is an amenable number.

123315405154477 is a deficient number, since it is larger than the sum of its proper divisors (1).

123315405154477 is an equidigital number, since it uses as much as digits as its factorization.

123315405154477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056000, while the sum is 52.

Adding to 123315405154477 its reverse (774451504513321), we get a palindrome (897766909667798).

The spelling of 123315405154477 in words is "one hundred twenty-three trillion, three hundred fifteen billion, four hundred five million, one hundred fifty-four thousand, four hundred seventy-seven".