662342351821 has 4 divisors (see below), whose sum is σ = 701303666652. Its totient is φ = 623381036992.

The previous prime is 662342351779. The next prime is 662342351831. The reversal of 662342351821 is 128153243266.

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

It can be written as a sum of positive squares in 2 ways, for example, as 553402088100 + 108940263721 = 743910^2 + 330061^2 .

It is a cyclic number.

It is not a de Polignac number, because 662342351821 - 2⁹ = 662342351309 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 (662342351831) 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, 19480657390 + ... + 19480657423.

It is an arithmetic number, because the mean of its divisors is an integer number (175325916663).

Almost surely, 2^662342351821 is an apocalyptic number.

It is an amenable number.

662342351821 is a deficient number, since it is larger than the sum of its proper divisors (38961314831).

662342351821 is a wasteful number, since it uses less digits than its factorization.

662342351821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38961314830.

The product of its digits is 414720, while the sum is 43.

The spelling of 662342351821 in words is "six hundred sixty-two billion, three hundred forty-two million, three hundred fifty-one thousand, eight hundred twenty-one".