6400361551 has 2 divisors, whose sum is σ = 6400361552. Its totient is φ = 6400361550.

The previous prime is 6400361549. The next prime is 6400361609. The reversal of 6400361551 is 1551630046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6400361551 - 2¹ = 6400361549 is a prime.

It is a super-4 number, since 4×6400361551⁴ (a number of 40 digits) contains 4444 as substring.

Together with 6400361549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6400361521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200180775 + 3200180776.

It is an arithmetic number, because the mean of its divisors is an integer number (3200180776).

Almost surely, 2^6400361551 is an apocalyptic number.

6400361551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400361551 is an equidigital number, since it uses as much as digits as its factorization.

6400361551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 6400361551 is about 80002.2596618371. The cubic root of 6400361551 is about 1856.6704946844.

Adding to 6400361551 its reverse (1551630046), we get a palindrome (7951991597).

The spelling of 6400361551 in words is "six billion, four hundred million, three hundred sixty-one thousand, five hundred fifty-one".