4020646555 has 4 divisors (see below), whose sum is σ = 4824775872. Its totient is φ = 3216517240.

The previous prime is 4020646547. The next prime is 4020646561. The reversal of 4020646555 is 5556460204.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 4020646555 - 2³ = 4020646547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402064651 + ... + 402064660.

It is an arithmetic number, because the mean of its divisors is an integer number (1206193968).

Almost surely, 2^4020646555 is an apocalyptic number.

4020646555 is a deficient number, since it is larger than the sum of its proper divisors (804129317).

4020646555 is an equidigital number, since it uses as much as digits as its factorization.

4020646555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804129316.

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 4020646555 is about 63408.5684667301. The cubic root of 4020646555 is about 1590.1275631738.

The spelling of 4020646555 in words is "four billion, twenty million, six hundred forty-six thousand, five hundred fifty-five".