145447631671 has 4 divisors (see below), whose sum is σ = 153102770200. Its totient is φ = 137792493144.

The previous prime is 145447631611. The next prime is 145447631677. The reversal of 145447631671 is 176136744541.

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 145447631671 - 2³¹ = 143300148023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145447631677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3827569236 + ... + 3827569273.

It is an arithmetic number, because the mean of its divisors is an integer number (38275692550).

Almost surely, 2^145447631671 is an apocalyptic number.

145447631671 is a deficient number, since it is larger than the sum of its proper divisors (7655138529).

145447631671 is an equidigital number, since it uses as much as digits as its factorization.

145447631671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7655138528.

The product of its digits is 1693440, while the sum is 49.

The spelling of 145447631671 in words is "one hundred forty-five billion, four hundred forty-seven million, six hundred thirty-one thousand, six hundred seventy-one".