6556374661 has 2 divisors, whose sum is σ = 6556374662. Its totient is φ = 6556374660.

The previous prime is 6556374637. The next prime is 6556374703. The reversal of 6556374661 is 1664736556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5199852100 + 1356522561 = 72110^2 + 36831^2 .

It is a cyclic number.

It is not a de Polignac number, because 6556374661 - 2¹⁹ = 6555850373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6556374161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3278187330 + 3278187331.

It is an arithmetic number, because the mean of its divisors is an integer number (3278187331).

Almost surely, 2^6556374661 is an apocalyptic number.

It is an amenable number.

6556374661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6556374661 is an equidigital number, since it uses as much as digits as its factorization.

6556374661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 49.

The square root of 6556374661 is about 80971.4434908999. The cubic root of 6556374661 is about 1871.6354153882.

The spelling of 6556374661 in words is "six billion, five hundred fifty-six million, three hundred seventy-four thousand, six hundred sixty-one".