144517978571 has 4 divisors (see below), whose sum is σ = 153019036152. Its totient is φ = 136016920992.

The previous prime is 144517978567. The next prime is 144517978607. The reversal of 144517978571 is 175879715441.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 144517978571 - 2² = 144517978567 is a prime.

It is a super-2 number, since 2×144517978571² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 144517978571.

It is not an unprimeable number, because it can be changed into a prime (144517978541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4250528765 + ... + 4250528798.

It is an arithmetic number, because the mean of its divisors is an integer number (38254759038).

Almost surely, 2^144517978571 is an apocalyptic number.

144517978571 is a deficient number, since it is larger than the sum of its proper divisors (8501057581).

144517978571 is an equidigital number, since it uses as much as digits as its factorization.

144517978571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8501057580.

The product of its digits is 9878400, while the sum is 59.

The spelling of 144517978571 in words is "one hundred forty-four billion, five hundred seventeen million, nine hundred seventy-eight thousand, five hundred seventy-one".