78381750011 has 4 divisors (see below), whose sum is σ = 78387267432. Its totient is φ = 78376232592.

The previous prime is 78381749993. The next prime is 78381750017. The reversal of 78381750011 is 11005718387.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11005718387 = 47 ⋅234164221.

It is a cyclic number.

It is not a de Polignac number, because 78381750011 - 2³⁰ = 77308008187 is a prime.

It is a super-2 number, since 2×78381750011² (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 (78381750017) 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, 2737346 + ... + 2765831.

It is an arithmetic number, because the mean of its divisors is an integer number (19596816858).

Almost surely, 2^78381750011 is an apocalyptic number.

78381750011 is a deficient number, since it is larger than the sum of its proper divisors (5517421).

78381750011 is a wasteful number, since it uses less digits than its factorization.

78381750011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5517420.

The product of its (nonzero) digits is 47040, while the sum is 41.

The spelling of 78381750011 in words is "seventy-eight billion, three hundred eighty-one million, seven hundred fifty thousand, eleven".