6551178463729 has 9 divisors (see below), whose sum is σ = 6563669661003. Its totient is φ = 6538711007712.

The previous prime is 6551178463721. The next prime is 6551178463733. The reversal of 6551178463729 is 9273648711556.

The square root of 6551178463729 is 2559527.

It is a perfect power (a square), and thus also a powerful number.

6551178463729 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1776289200625 + 4774889263104 = 1332775^2 + 2185152^2 .

It is not a de Polignac number, because 6551178463729 - 2³ = 6551178463721 is a prime.

It is a super-3 number, since 3×6551178463729³ (a number of 39 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6551178463721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1533154537 + ... + 1533158809.

Almost surely, 2^{6551178463729} is an apocalyptic number.

6551178463729 is the 2559527-th square number.

6551178463729 is the 1279764-th centered octagonal number.

It is an amenable number.

6551178463729 is a deficient number, since it is larger than the sum of its proper divisors (12491197274).

6551178463729 is an frugal number, since it uses more digits than its factorization.

6551178463729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9744 (or 4872 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 64.

Multiplying 6551178463729 by its sum of digits (64), we get a square (419275421678656 = 20476216²).

The spelling of 6551178463729 in words is "six trillion, five hundred fifty-one billion, one hundred seventy-eight million, four hundred sixty-three thousand, seven hundred twenty-nine".