78378940123 has 4 divisors (see below), whose sum is σ = 85504298328. Its totient is φ = 71253581920.

The previous prime is 78378940097. The next prime is 78378940127. The reversal of 78378940123 is 32104987387.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78378940123 - 2¹³ = 78378931931 is a prime.

It is a super-2 number, since 2×78378940123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78378940127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3562679086 + ... + 3562679107.

It is an arithmetic number, because the mean of its divisors is an integer number (21376074582).

Almost surely, 2^78378940123 is an apocalyptic number.

78378940123 is a deficient number, since it is larger than the sum of its proper divisors (7125358205).

78378940123 is a wasteful number, since it uses less digits than its factorization.

78378940123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7125358204.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The spelling of 78378940123 in words is "seventy-eight billion, three hundred seventy-eight million, nine hundred forty thousand, one hundred twenty-three".