5205678778172 has 48 divisors (see below), whose sum is σ = 10153812775680. Its totient is φ = 2320724448000.

The previous prime is 5205678778171. The next prime is 5205678778177. The reversal of 5205678778172 is 2718778765025.

It is a super-3 number, since 3×5205678778172³ (a number of 39 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 5205678778099 and 5205678778108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5205678778171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73855547 + ... + 73925997.

It is an arithmetic number, because the mean of its divisors is an integer number (211537766160).

Almost surely, 2^{5205678778172} is an apocalyptic number.

It is an amenable number.

5205678778172 is a deficient number, since it is larger than the sum of its proper divisors (4948133997508).

5205678778172 is a wasteful number, since it uses less digits than its factorization.

5205678778172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127682 (or 127680 counting only the distinct ones).

The product of its (nonzero) digits is 92198400, while the sum is 65.

The spelling of 5205678778172 in words is "five trillion, two hundred five billion, six hundred seventy-eight million, seven hundred seventy-eight thousand, one hundred seventy-two".