2155425637 has 4 divisors (see below), whose sum is σ = 2207997036. Its totient is φ = 2102854240.

The previous prime is 2155425617. The next prime is 2155425647. The reversal of 2155425637 is 7365245512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 890485281 + 1264940356 = 29841^2 + 35566^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155425637 - 2⁷ = 2155425509 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155425637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155425617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26285638 + ... + 26285719.

It is an arithmetic number, because the mean of its divisors is an integer number (551999259).

Almost surely, 2^2155425637 is an apocalyptic number.

It is an amenable number.

2155425637 is a deficient number, since it is larger than the sum of its proper divisors (52571399).

2155425637 is an equidigital number, since it uses as much as digits as its factorization.

2155425637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52571398.

The product of its digits is 252000, while the sum is 40.

The square root of 2155425637 is about 46426.5617615606. The cubic root of 2155425637 is about 1291.7476536960.

The spelling of 2155425637 in words is "two billion, one hundred fifty-five million, four hundred twenty-five thousand, six hundred thirty-seven".