2155520015 has 24 divisors (see below), whose sum is σ = 3010407120. Its totient is φ = 1475429120.

The previous prime is 2155520011. The next prime is 2155520053. The reversal of 2155520015 is 5100255512.

It is not a de Polignac number, because 2155520015 - 2² = 2155520011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155520011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94505 + ... + 115074.

It is an arithmetic number, because the mean of its divisors is an integer number (125433630).

Almost surely, 2^2155520015 is an apocalyptic number.

2155520015 is a deficient number, since it is larger than the sum of its proper divisors (854887105).

2155520015 is a wasteful number, since it uses less digits than its factorization.

2155520015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209623 (or 209612 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 2155520015 is about 46427.5781728920. The cubic root of 2155520015 is about 1291.7665070149.

Adding to 2155520015 its reverse (5100255512), we get a palindrome (7255775527).

The spelling of 2155520015 in words is "two billion, one hundred fifty-five million, five hundred twenty thousand, fifteen".