1145644721075 has 24 divisors (see below), whose sum is σ = 1468399635456. Its totient is φ = 885756564000.

The previous prime is 1145644721057. The next prime is 1145644721129. The reversal of 1145644721075 is 5701274465411.

It is a happy number.

It is not a de Polignac number, because 1145644721075 - 2⁴⁰ = 46133093299 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 418961 + ... + 1570610.

It is an arithmetic number, because the mean of its divisors is an integer number (61183318144).

Almost surely, 2^{1145644721075} is an apocalyptic number.

1145644721075 is a deficient number, since it is larger than the sum of its proper divisors (322754914381).

1145644721075 is a wasteful number, since it uses less digits than its factorization.

1145644721075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990355 (or 1990350 counting only the distinct ones).

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

The spelling of 1145644721075 in words is "one trillion, one hundred forty-five billion, six hundred forty-four million, seven hundred twenty-one thousand, seventy-five".