6420666511 has 8 divisors (see below), whose sum is σ = 7339304960. Its totient is φ = 5502378168.

The previous prime is 6420666493. The next prime is 6420666517. The reversal of 6420666511 is 1156660246.

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

It is not a de Polignac number, because 6420666511 - 2¹¹ = 6420664463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420666517) 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, 46971 + ... + 122668.

It is an arithmetic number, because the mean of its divisors is an integer number (917413120).

Almost surely, 2^6420666511 is an apocalyptic number.

6420666511 is a deficient number, since it is larger than the sum of its proper divisors (918638449).

6420666511 is a wasteful number, since it uses less digits than its factorization.

6420666511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175053.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 6420666511 is about 80129.0615881654. The cubic root of 6420666511 is about 1858.6318330121.

The spelling of 6420666511 in words is "six billion, four hundred twenty million, six hundred sixty-six thousand, five hundred eleven".