145271808987 has 4 divisors (see below), whose sum is σ = 193695745320. Its totient is φ = 96847872656.

The previous prime is 145271808953. The next prime is 145271809003. The reversal of 145271808987 is 789808172541.

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 145271808987 - 2²² = 145267614683 is a prime.

It is a super-2 number, since 2×145271808987² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145271808987.

It is not an unprimeable number, because it can be changed into a prime (145271808887) 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, 24211968162 + ... + 24211968167.

It is an arithmetic number, because the mean of its divisors is an integer number (48423936330).

Almost surely, 2^145271808987 is an apocalyptic number.

145271808987 is a deficient number, since it is larger than the sum of its proper divisors (48423936333).

145271808987 is an equidigital number, since it uses as much as digits as its factorization.

145271808987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48423936332.

The product of its (nonzero) digits is 9031680, while the sum is 60.

The spelling of 145271808987 in words is "one hundred forty-five billion, two hundred seventy-one million, eight hundred eight thousand, nine hundred eighty-seven".