2155061803 has 4 divisors (see below), whose sum is σ = 2207624328. Its totient is φ = 2102499280.

The previous prime is 2155061773. The next prime is 2155061807. The reversal of 2155061803 is 3081605512.

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

It is a cyclic number.

It is not a de Polignac number, because 2155061803 - 2¹³ = 2155053611 is a prime.

It is a super-2 number, since 2×2155061803² = 9288582749499221618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155061807) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 26281201 + ... + 26281282.

It is an arithmetic number, because the mean of its divisors is an integer number (551906082).

Almost surely, 2^2155061803 is an apocalyptic number.

2155061803 is a deficient number, since it is larger than the sum of its proper divisors (52562525).

2155061803 is an equidigital number, since it uses as much as digits as its factorization.

2155061803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52562524.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 2155061803 is about 46422.6432142764. The cubic root of 2155061803 is about 1291.6749676405.

The spelling of 2155061803 in words is "two billion, one hundred fifty-five million, sixty-one thousand, eight hundred three".