6662344561 has 4 divisors (see below), whose sum is σ = 6662576500. Its totient is φ = 6662112624.

The previous prime is 6662344553. The next prime is 6662344597. The reversal of 6662344561 is 1654432666.

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 6602375025 + 59969536 = 81255^2 + 7744^2 .

It is a cyclic number.

It is not a de Polignac number, because 6662344561 - 2³ = 6662344553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6662344501) 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, 65586 + ... + 132763.

It is an arithmetic number, because the mean of its divisors is an integer number (1665644125).

Almost surely, 2^6662344561 is an apocalyptic number.

It is an amenable number.

6662344561 is a deficient number, since it is larger than the sum of its proper divisors (231939).

6662344561 is a wasteful number, since it uses less digits than its factorization.

6662344561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231938.

The product of its digits is 622080, while the sum is 43.

The square root of 6662344561 is about 81623.1864178311. The cubic root of 6662344561 is about 1881.6652441195.

The spelling of 6662344561 in words is "six billion, six hundred sixty-two million, three hundred forty-four thousand, five hundred sixty-one".