1545644244073 has 2 divisors, whose sum is σ = 1545644244074. Its totient is φ = 1545644244072.

The previous prime is 1545644244043. The next prime is 1545644244127. The reversal of 1545644244073 is 3704424465451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1237938841129 + 307705402944 = 1112627^2 + 554712^2 .

It is an emirp because it is prime and its reverse (3704424465451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1545644244073 - 2⁵ = 1545644244041 is a prime.

It is a super-2 number, since 2×1545644244073² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1545644244043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772822122036 + 772822122037.

It is an arithmetic number, because the mean of its divisors is an integer number (772822122037).

Almost surely, 2^{1545644244073} is an apocalyptic number.

It is an amenable number.

1545644244073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545644244073 is an equidigital number, since it uses as much as digits as its factorization.

1545644244073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6451200, while the sum is 49.

The spelling of 1545644244073 in words is "one trillion, five hundred forty-five billion, six hundred forty-four million, two hundred forty-four thousand, seventy-three".