2403644645123 has 2 divisors, whose sum is σ = 2403644645124. Its totient is φ = 2403644645122.

The previous prime is 2403644645099. The next prime is 2403644645167. The reversal of 2403644645123 is 3215464463042.

It is a happy number.

It is an a-pointer prime, because the next prime (2403644645167) can be obtained adding 2403644645123 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2403644645123 - 2²² = 2403640450819 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2403644645723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1201822322561 + 1201822322562.

It is an arithmetic number, because the mean of its divisors is an integer number (1201822322562).

Almost surely, 2^{2403644645123} is an apocalyptic number.

2403644645123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2403644645123 is an equidigital number, since it uses as much as digits as its factorization.

2403644645123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1658880, while the sum is 44.

The spelling of 2403644645123 in words is "two trillion, four hundred three billion, six hundred forty-four million, six hundred forty-five thousand, one hundred twenty-three".