662144639 has 4 divisors (see below), whose sum is σ = 713078856. Its totient is φ = 611210424.

The previous prime is 662144633. The next prime is 662144641. The reversal of 662144639 is 936441266.

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 662144639 - 2²⁰ = 661096063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 662144596 and 662144605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662144633) 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, 25467089 + ... + 25467114.

It is an arithmetic number, because the mean of its divisors is an integer number (178269714).

Almost surely, 2^662144639 is an apocalyptic number.

662144639 is a deficient number, since it is larger than the sum of its proper divisors (50934217).

662144639 is a wasteful number, since it uses less digits than its factorization.

662144639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50934216.

The product of its digits is 186624, while the sum is 41.

The square root of 662144639 is about 25732.1712842115. The cubic root of 662144639 is about 871.6008044117.

The spelling of 662144639 in words is "six hundred sixty-two million, one hundred forty-four thousand, six hundred thirty-nine".