6445272155 has 16 divisors (see below), whose sum is σ = 9124368384. Its totient is φ = 4277046240.

The previous prime is 6445272137. The next prime is 6445272199. The reversal of 6445272155 is 5512725446.

It is not a de Polignac number, because 6445272155 - 2¹² = 6445268059 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2969087 + ... + 2971256.

It is an arithmetic number, because the mean of its divisors is an integer number (570273024).

Almost surely, 2^6445272155 is an apocalyptic number.

6445272155 is a deficient number, since it is larger than the sum of its proper divisors (2679096229).

6445272155 is a wasteful number, since it uses less digits than its factorization.

6445272155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5940386.

The product of its digits is 336000, while the sum is 41.

The square root of 6445272155 is about 80282.4523479446. The cubic root of 6445272155 is about 1861.0030581387.

The spelling of 6445272155 in words is "six billion, four hundred forty-five million, two hundred seventy-two thousand, one hundred fifty-five".