2156774453 has 2 divisors, whose sum is σ = 2156774454. Its totient is φ = 2156774452.

The previous prime is 2156774447. The next prime is 2156774467. The reversal of 2156774453 is 3544776512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2020772209 + 136002244 = 44953^2 + 11662^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156774453 is a prime.

It is a super-2 number, since 2×2156774453² = 9303352082226898418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156773453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078387226 + 1078387227.

It is an arithmetic number, because the mean of its divisors is an integer number (1078387227).

Almost surely, 2^2156774453 is an apocalyptic number.

It is an amenable number.

2156774453 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156774453 is an equidigital number, since it uses as much as digits as its factorization.

2156774453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 44.

The square root of 2156774453 is about 46441.0858292525. The cubic root of 2156774453 is about 1292.0170462099.

The spelling of 2156774453 in words is "two billion, one hundred fifty-six million, seven hundred seventy-four thousand, four hundred fifty-three".