6446979437 has 2 divisors, whose sum is σ = 6446979438. Its totient is φ = 6446979436.

The previous prime is 6446979397. The next prime is 6446979503. The reversal of 6446979437 is 7349796446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3302685961 + 3144293476 = 57469^2 + 56074^2 .

It is a cyclic number.

It is not a de Polignac number, because 6446979437 - 2¹⁰ = 6446978413 is a prime.

It is a super-2 number, since 2×6446979437² = 83127087722201673938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6446979337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3223489718 + 3223489719.

It is an arithmetic number, because the mean of its divisors is an integer number (3223489719).

Almost surely, 2^6446979437 is an apocalyptic number.

It is an amenable number.

6446979437 is a deficient number, since it is larger than the sum of its proper divisors (1).

6446979437 is an equidigital number, since it uses as much as digits as its factorization.

6446979437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 59.

The square root of 6446979437 is about 80293.0846150526. The cubic root of 6446979437 is about 1861.1673634076.

The spelling of 6446979437 in words is "six billion, four hundred forty-six million, nine hundred seventy-nine thousand, four hundred thirty-seven".