6551977 has 4 divisors (see below), whose sum is σ = 6596100. Its totient is φ = 6507856.

The previous prime is 6551959. The next prime is 6551983. The reversal of 6551977 is 7791556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1838736 + 4713241 = 1356^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 6551977 - 2¹⁵ = 6519209 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6551917) 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, 21838 + ... + 22135.

It is an arithmetic number, because the mean of its divisors is an integer number (1649025).

Almost surely, 2^6551977 is an apocalyptic number.

It is an amenable number.

6551977 is a deficient number, since it is larger than the sum of its proper divisors (44123).

6551977 is a wasteful number, since it uses less digits than its factorization.

6551977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44122.

The product of its digits is 66150, while the sum is 40.

The square root of 6551977 is about 2559.6829881843. The cubic root of 6551977 is about 187.1216857905.

The spelling of 6551977 in words is "six million, five hundred fifty-one thousand, nine hundred seventy-seven".