6420427651 has 8 divisors (see below), whose sum is σ = 7005334464. Its totient is φ = 5835726120.

The previous prime is 6420427649. The next prime is 6420427661. The reversal of 6420427651 is 1567240246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6420427651 - 2¹ = 6420427649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6420427651.

It is not an unprimeable number, because it can be changed into a prime (6420427661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18180 + ... + 114766.

It is an arithmetic number, because the mean of its divisors is an integer number (875666808).

Almost surely, 2^6420427651 is an apocalyptic number.

6420427651 is a deficient number, since it is larger than the sum of its proper divisors (584906813).

6420427651 is a wasteful number, since it uses less digits than its factorization.

6420427651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102641.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 6420427651 is about 80127.5711038342. The cubic root of 6420427651 is about 1858.6087846102.

Adding to 6420427651 its reverse (1567240246), we get a palindrome (7987667897).

The spelling of 6420427651 in words is "six billion, four hundred twenty million, four hundred twenty-seven thousand, six hundred fifty-one".