1145644721057 has 2 divisors, whose sum is σ = 1145644721058. Its totient is φ = 1145644721056.

The previous prime is 1145644720999. The next prime is 1145644721129. The reversal of 1145644721057 is 7501274465411.

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., 688052001121 + 457592719936 = 829489^2 + 676456^2 .

It is an emirp because it is prime and its reverse (7501274465411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1145644721057 - 2⁶ = 1145644720993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1145644721657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572822360528 + 572822360529.

It is an arithmetic number, because the mean of its divisors is an integer number (572822360529).

Almost surely, 2^{1145644721057} is an apocalyptic number.

It is an amenable number.

1145644721057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145644721057 is an equidigital number, since it uses as much as digits as its factorization.

1145644721057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 940800, while the sum is 47.

The spelling of 1145644721057 in words is "one trillion, one hundred forty-five billion, six hundred forty-four million, seven hundred twenty-one thousand, fifty-seven".