6646977841 has 27 divisors (see below), whose sum is σ = 8173909611. Its totient is φ = 5388740784.

The previous prime is 6646977829. The next prime is 6646977847. The reversal of 6646977841 is 1487796466.

The square root of 6646977841 is 81529.

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

It can be written as a sum of positive squares in only one way, i.e., 21669025 + 6625308816 = 4655^2 + 81396^2 .

It is not a de Polignac number, because 6646977841 - 2¹¹ = 6646975793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6646977847) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 10843051 + ... + 10843663.

It is an arithmetic number, because the mean of its divisors is an integer number (302737393).

Almost surely, 2^6646977841 is an apocalyptic number.

6646977841 is the 81529-th square number.

6646977841 is the 40765-th centered octagonal number.

It is an amenable number.

6646977841 is a deficient number, since it is larger than the sum of its proper divisors (1526931770).

6646977841 is an frugal number, since it uses more digits than its factorization.

6646977841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278 (or 639 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 58.

The cubic root of 6646977841 is about 1880.2174413692.

The spelling of 6646977841 in words is "six billion, six hundred forty-six million, nine hundred seventy-seven thousand, eight hundred forty-one".