123781868032901 has 16 divisors (see below), whose sum is σ = 135821315485296. Its totient is φ = 112102184004096.

The previous prime is 123781868032873. The next prime is 123781868032919. The reversal of 123781868032901 is 109230868187321.

It is a Cunningham number, because it is equal to 11125730²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 3212661912100 + 120569206120801 = 1792390^2 + 10980401^2 .

It is not a de Polignac number, because 123781868032901 - 2²² = 123781863838597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123781868032981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34802681 + ... + 38194113.

It is an arithmetic number, because the mean of its divisors is an integer number (8488832217831).

Almost surely, 2^{123781868032901} is an apocalyptic number.

It is an amenable number.

123781868032901 is a deficient number, since it is larger than the sum of its proper divisors (12039447452395).

123781868032901 is a wasteful number, since it uses less digits than its factorization.

123781868032901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444472.

The product of its (nonzero) digits is 6967296, while the sum is 59.

The spelling of 123781868032901 in words is "one hundred twenty-three trillion, seven hundred eighty-one billion, eight hundred sixty-eight million, thirty-two thousand, nine hundred one".