2156236505 has 16 divisors (see below), whose sum is σ = 2673390720. Its totient is φ = 1668498048.

The previous prime is 2156236483. The next prime is 2156236519. The reversal of 2156236505 is 5056326512.

It is a cyclic number.

It is not a de Polignac number, because 2156236505 - 2²⁶ = 2089127641 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 26540 + ... + 70829.

It is an arithmetic number, because the mean of its divisors is an integer number (167086920).

Almost surely, 2^2156236505 is an apocalyptic number.

It is an amenable number.

2156236505 is a deficient number, since it is larger than the sum of its proper divisors (517154215).

2156236505 is a wasteful number, since it uses less digits than its factorization.

2156236505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97520.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 2156236505 is about 46435.2937430141. The cubic root of 2156236505 is about 1291.9096179190.

The spelling of 2156236505 in words is "two billion, one hundred fifty-six million, two hundred thirty-six thousand, five hundred five".