78384928123 has 2 divisors, whose sum is σ = 78384928124. Its totient is φ = 78384928122.

The previous prime is 78384928087. The next prime is 78384928133. The reversal of 78384928123 is 32182948387.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78384928123 - 2²⁵ = 78351373691 is a prime.

It is a super-2 number, since 2×78384928123² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78384928133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39192464061 + 39192464062.

It is an arithmetic number, because the mean of its divisors is an integer number (39192464062).

Almost surely, 2^78384928123 is an apocalyptic number.

78384928123 is a deficient number, since it is larger than the sum of its proper divisors (1).

78384928123 is an equidigital number, since it uses as much as digits as its factorization.

78384928123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 55.

The spelling of 78384928123 in words is "seventy-eight billion, three hundred eighty-four million, nine hundred twenty-eight thousand, one hundred twenty-three".