2521640155 has 8 divisors (see below), whose sum is σ = 3044533392. Its totient is φ = 2004935328.

The previous prime is 2521640137. The next prime is 2521640159. The reversal of 2521640155 is 5510461252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2521640155 - 2¹³ = 2521631963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521640159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1546204 + ... + 1547833.

It is an arithmetic number, because the mean of its divisors is an integer number (380566674).

Almost surely, 2^2521640155 is an apocalyptic number.

2521640155 is a deficient number, since it is larger than the sum of its proper divisors (522893237).

2521640155 is a wasteful number, since it uses less digits than its factorization.

2521640155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094205.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 2521640155 is about 50215.9352695935. The cubic root of 2521640155 is about 1361.1135910597.

The spelling of 2521640155 in words is "two billion, five hundred twenty-one million, six hundred forty thousand, one hundred fifty-five".