5178078781 has 4 divisors (see below), whose sum is σ = 5194728864. Its totient is φ = 5161428700.

The previous prime is 5178078761. The next prime is 5178078799. The reversal of 5178078781 is 1878708715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5178078781 - 2⁵ = 5178078749 is a prime.

It is a super-2 number, since 2×5178078781² = 53624999724484891922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5178078751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8324575 + ... + 8325196.

It is an arithmetic number, because the mean of its divisors is an integer number (1298682216).

Almost surely, 2^5178078781 is an apocalyptic number.

It is an amenable number.

5178078781 is a deficient number, since it is larger than the sum of its proper divisors (16650083).

5178078781 is a wasteful number, since it uses less digits than its factorization.

5178078781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16650082.

The product of its (nonzero) digits is 878080, while the sum is 52.

The square root of 5178078781 is about 71958.8686750980. The cubic root of 5178078781 is about 1730.0402923112.

The spelling of 5178078781 in words is "five billion, one hundred seventy-eight million, seventy-eight thousand, seven hundred eighty-one".