123721746255799 has 2 divisors, whose sum is σ = 123721746255800. Its totient is φ = 123721746255798.

The previous prime is 123721746255673. The next prime is 123721746255847. The reversal of 123721746255799 is 997552647127321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123721746255799 - 2⁹ = 123721746255287 is a prime.

It is a super-2 number, since 2×123721746255799² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123721746250799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61860873127899 + 61860873127900.

It is an arithmetic number, because the mean of its divisors is an integer number (61860873127900).

Almost surely, 2^{123721746255799} is an apocalyptic number.

123721746255799 is a deficient number, since it is larger than the sum of its proper divisors (1).

123721746255799 is an equidigital number, since it uses as much as digits as its factorization.

123721746255799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400075200, while the sum is 70.

The spelling of 123721746255799 in words is "one hundred twenty-three trillion, seven hundred twenty-one billion, seven hundred forty-six million, two hundred fifty-five thousand, seven hundred ninety-nine".