6420510556 has 12 divisors (see below), whose sum is σ = 11284960120. Its totient is φ = 3196236240.

The previous prime is 6420510553. The next prime is 6420510583. The reversal of 6420510556 is 6550150246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420510553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3503730 + ... + 3505561.

Almost surely, 2^6420510556 is an apocalyptic number.

It is an amenable number.

6420510556 is a deficient number, since it is larger than the sum of its proper divisors (4864449564).

6420510556 is a wasteful number, since it uses less digits than its factorization.

6420510556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7009524 (or 7009522 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 6420510556 is about 80128.0884334576. The cubic root of 6420510556 is about 1858.6167844563.

The spelling of 6420510556 in words is "six billion, four hundred twenty million, five hundred ten thousand, five hundred fifty-six".