6549901551 has 6 divisors (see below), whose sum is σ = 9460968920. Its totient is φ = 4366601028.

The previous prime is 6549901543. The next prime is 6549901571. The reversal of 6549901551 is 1551099456.

It is a happy number.

6549901551 is a `hidden beast` number, since 6 + 5 + 4 + 9 + 90 + 1 + 551 = 666.

It is not a de Polignac number, because 6549901551 - 2³ = 6549901543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6549901497 and 6549901506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6549901571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 363883411 + ... + 363883428.

Almost surely, 2^6549901551 is an apocalyptic number.

6549901551 is a deficient number, since it is larger than the sum of its proper divisors (2911067369).

6549901551 is a wasteful number, since it uses less digits than its factorization.

6549901551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727766845 (or 727766842 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The square root of 6549901551 is about 80931.4620589546. The cubic root of 6549901551 is about 1871.0192572273.

The spelling of 6549901551 in words is "six billion, five hundred forty-nine million, nine hundred one thousand, five hundred fifty-one".