2155420245 has 32 divisors (see below), whose sum is σ = 3804485760. Its totient is φ = 1033303040.

The previous prime is 2155420213. The next prime is 2155420283. The reversal of 2155420245 is 5420245512.

It is not a de Polignac number, because 2155420245 - 2⁵ = 2155420213 is a prime.

It is a super-3 number, since 3×2155420245³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 58704 + ... + 88073.

It is an arithmetic number, because the mean of its divisors is an integer number (118890180).

Almost surely, 2^2155420245 is an apocalyptic number.

It is an amenable number.

2155420245 is a deficient number, since it is larger than the sum of its proper divisors (1649065515).

2155420245 is a wasteful number, since it uses less digits than its factorization.

2155420245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146885.

The product of its (nonzero) digits is 16000, while the sum is 30.

The square root of 2155420245 is about 46426.5036913184. The cubic root of 2155420245 is about 1291.7465765523.

Adding to 2155420245 its reverse (5420245512), we get a palindrome (7575665757).

The spelling of 2155420245 in words is "two billion, one hundred fifty-five million, four hundred twenty thousand, two hundred forty-five".