6440161477 has 2 divisors, whose sum is σ = 6440161478. Its totient is φ = 6440161476.

The previous prime is 6440161463. The next prime is 6440161487. The reversal of 6440161477 is 7741610446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3937060516 + 2503100961 = 62746^2 + 50031^2 .

It is a cyclic number.

It is not a de Polignac number, because 6440161477 - 2¹⁹ = 6439637189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6440161487) 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, 3220080738 + 3220080739.

It is an arithmetic number, because the mean of its divisors is an integer number (3220080739).

Almost surely, 2^6440161477 is an apocalyptic number.

It is an amenable number.

6440161477 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440161477 is an equidigital number, since it uses as much as digits as its factorization.

6440161477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 6440161477 is about 80250.6166767583. The cubic root of 6440161477 is about 1860.5110436238.

The spelling of 6440161477 in words is "six billion, four hundred forty million, one hundred sixty-one thousand, four hundred seventy-seven".