6477845021 has 2 divisors, whose sum is σ = 6477845022. Its totient is φ = 6477845020.

The previous prime is 6477844993. The next prime is 6477845083. The reversal of 6477845021 is 1205487746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5092963225 + 1384881796 = 71365^2 + 37214^2 .

It is a cyclic number.

It is not a de Polignac number, because 6477845021 - 2³⁰ = 5404103197 is a prime.

It is a super-2 number, since 2×6477845021² = 83924952232188980882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6477815021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3238922510 + 3238922511.

It is an arithmetic number, because the mean of its divisors is an integer number (3238922511).

Almost surely, 2^6477845021 is an apocalyptic number.

It is an amenable number.

6477845021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6477845021 is an equidigital number, since it uses as much as digits as its factorization.

6477845021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 376320, while the sum is 44.

The square root of 6477845021 is about 80485.0608560371. The cubic root of 6477845021 is about 1864.1328133498.

The spelling of 6477845021 in words is "six billion, four hundred seventy-seven million, eight hundred forty-five thousand, twenty-one".