1455645543221 has 2 divisors, whose sum is σ = 1455645543222. Its totient is φ = 1455645543220.

The previous prime is 1455645543193. The next prime is 1455645543227. The reversal of 1455645543221 is 1223455465541.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1334057340196 + 121588203025 = 1155014^2 + 348695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1455645543221 - 2²⁶ = 1455578434357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1455645543227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 727822771610 + 727822771611.

It is an arithmetic number, because the mean of its divisors is an integer number (727822771611).

Almost surely, 2^{1455645543221} is an apocalyptic number.

It is an amenable number.

1455645543221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1455645543221 is an equidigital number, since it uses as much as digits as its factorization.

1455645543221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880000, while the sum is 47.

The spelling of 1455645543221 in words is "one trillion, four hundred fifty-five billion, six hundred forty-five million, five hundred forty-three thousand, two hundred twenty-one".