1445255561 has 16 divisors (see below), whose sum is σ = 1550700288. Its totient is φ = 1342176000.

The previous prime is 1445255549. The next prime is 1445255597. The reversal of 1445255561 is 1655525441.

It is a cyclic number.

It is not a de Polignac number, because 1445255561 - 2¹⁰ = 1445254537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1445254561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 567056 + ... + 569598.

It is an arithmetic number, because the mean of its divisors is an integer number (96918768).

Almost surely, 2^1445255561 is an apocalyptic number.

It is an amenable number.

1445255561 is a deficient number, since it is larger than the sum of its proper divisors (105444727).

1445255561 is a wasteful number, since it uses less digits than its factorization.

1445255561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992.

The product of its digits is 120000, while the sum is 38.

The square root of 1445255561 is about 38016.5169498732. The cubic root of 1445255561 is about 1130.6153645714.

The spelling of 1445255561 in words is "one billion, four hundred forty-five million, two hundred fifty-five thousand, five hundred sixty-one".