6420566100 has 72 divisors (see below), whose sum is σ = 20005837600. Its totient is φ = 1580446080.

The previous prime is 6420566071. The next prime is 6420566101. The reversal of 6420566100 is 16650246.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420566101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 819250 + ... + 827049.

Almost surely, 2^6420566100 is an apocalyptic number.

6420566100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6420566100 is an abundant number, since it is smaller than the sum of its proper divisors (13585271500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6420566100 is a wasteful number, since it uses less digits than its factorization.

6420566100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646329 (or 1646322 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 6420566100 is about 80128.4350277728. The cubic root of 6420566100 is about 1858.6221440878.

It can be divided in two parts, 64205 and 66100, that added together give a triangular number (130305 = T₅₁₀).

The spelling of 6420566100 in words is "six billion, four hundred twenty million, five hundred sixty-six thousand, one hundred".