662005561 has 4 divisors (see below), whose sum is σ = 756577792. Its totient is φ = 567433332.

The previous prime is 662005549. The next prime is 662005567. The reversal of 662005561 is 165500266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165500266 = 2 ⋅82750133.

It is a cyclic number.

It is not a de Polignac number, because 662005561 - 2¹¹ = 662003513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (662005567) 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, 47286105 + ... + 47286118.

It is an arithmetic number, because the mean of its divisors is an integer number (189144448).

Almost surely, 2^662005561 is an apocalyptic number.

It is an amenable number.

662005561 is a deficient number, since it is larger than the sum of its proper divisors (94572231).

662005561 is an equidigital number, since it uses as much as digits as its factorization.

662005561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94572230.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 662005561 is about 25729.4687275117. The cubic root of 662005561 is about 871.5397759608.

The spelling of 662005561 in words is "six hundred sixty-two million, five thousand, five hundred sixty-one".