2157643263 has 8 divisors (see below), whose sum is σ = 2877123888. Its totient is φ = 1438295744.

The previous prime is 2157643231. The next prime is 2157643283. The reversal of 2157643263 is 3623467512.

2157643263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2157643263 - 2⁵ = 2157643231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157643283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14245 + ... + 67217.

It is an arithmetic number, because the mean of its divisors is an integer number (359640486).

Almost surely, 2^2157643263 is an apocalyptic number.

2157643263 is a deficient number, since it is larger than the sum of its proper divisors (719480625).

2157643263 is a wasteful number, since it uses less digits than its factorization.

2157643263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66553.

The product of its digits is 181440, while the sum is 39.

The square root of 2157643263 is about 46450.4387815659. The cubic root of 2157643263 is about 1292.1905099727.

The spelling of 2157643263 in words is "two billion, one hundred fifty-seven million, six hundred forty-three thousand, two hundred sixty-three".