6420171062155 has 16 divisors (see below), whose sum is σ = 7989246742464. Its totient is φ = 4948804632960.

The previous prime is 6420171062143. The next prime is 6420171062177. The reversal of 6420171062155 is 5512601710246.

It is not a de Polignac number, because 6420171062155 - 2⁷ = 6420171062027 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 (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168445156 + ... + 168483265.

It is an arithmetic number, because the mean of its divisors is an integer number (499327921404).

Almost surely, 2^{6420171062155} is an apocalyptic number.

6420171062155 is a deficient number, since it is larger than the sum of its proper divisors (1569075680309).

6420171062155 is a wasteful number, since it uses less digits than its factorization.

6420171062155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336928566.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 6420171062155 in words is "six trillion, four hundred twenty billion, one hundred seventy-one million, sixty-two thousand, one hundred fifty-five".