123011605407557 has 2 divisors, whose sum is σ = 123011605407558. Its totient is φ = 123011605407556.

The previous prime is 123011605407533. The next prime is 123011605407563. The reversal of 123011605407557 is 755704506110321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112641054336001 + 10370551071556 = 10613249^2 + 3220334^2 .

It is a cyclic number.

It is not a de Polignac number, because 123011605407557 - 2¹⁸ = 123011605145413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123011605487557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61505802703778 + 61505802703779.

It is an arithmetic number, because the mean of its divisors is an integer number (61505802703779).

Almost surely, 2^{123011605407557} is an apocalyptic number.

It is an amenable number.

123011605407557 is a deficient number, since it is larger than the sum of its proper divisors (1).

123011605407557 is an equidigital number, since it uses as much as digits as its factorization.

123011605407557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882000, while the sum is 47.

The spelling of 123011605407557 in words is "one hundred twenty-three trillion, eleven billion, six hundred five million, four hundred seven thousand, five hundred fifty-seven".