2156578433 has 2 divisors, whose sum is σ = 2156578434. Its totient is φ = 2156578432.

The previous prime is 2156578421. The next prime is 2156578439. The reversal of 2156578433 is 3348756512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1365450304 + 791128129 = 36952^2 + 28127^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156578433 is a prime.

It is not a weakly prime, because it can be changed into another prime (2156578439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078289216 + 1078289217.

It is an arithmetic number, because the mean of its divisors is an integer number (1078289217).

Almost surely, 2^2156578433 is an apocalyptic number.

It is an amenable number.

2156578433 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156578433 is an equidigital number, since it uses as much as digits as its factorization.

2156578433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 44.

The square root of 2156578433 is about 46438.9753655267. The cubic root of 2156578433 is about 1291.9779030574.

The spelling of 2156578433 in words is "two billion, one hundred fifty-six million, five hundred seventy-eight thousand, four hundred thirty-three".