6154147661 has 2 divisors, whose sum is σ = 6154147662. Its totient is φ = 6154147660.

The previous prime is 6154147639. The next prime is 6154147691. The reversal of 6154147661 is 1667414516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5729581636 + 424566025 = 75694^2 + 20605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6154147661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6154147691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3077073830 + 3077073831.

It is an arithmetic number, because the mean of its divisors is an integer number (3077073831).

Almost surely, 2^6154147661 is an apocalyptic number.

It is an amenable number.

6154147661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6154147661 is an equidigital number, since it uses as much as digits as its factorization.

6154147661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 6154147661 is about 78448.3757703115. The cubic root of 6154147661 is about 1832.5505817226.

The spelling of 6154147661 in words is "six billion, one hundred fifty-four million, one hundred forty-seven thousand, six hundred sixty-one".