662640057 has 6 divisors (see below), whose sum is σ = 957146762. Its totient is φ = 441760032.

The previous prime is 662640049. The next prime is 662640061. The reversal of 662640057 is 750046266.

662640057 is a `hidden beast` number, since 6 + 6 + 2 + 640 + 0 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 603979776 + 58660281 = 24576^2 + 7659^2 .

It is not a de Polignac number, because 662640057 - 2³ = 662640049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (662640047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36813328 + ... + 36813345.

Almost surely, 2^662640057 is an apocalyptic number.

It is an amenable number.

662640057 is a deficient number, since it is larger than the sum of its proper divisors (294506705).

662640057 is a wasteful number, since it uses less digits than its factorization.

662640057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73626679 (or 73626676 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 662640057 is about 25741.7959163692. The cubic root of 662640057 is about 871.8181280667.

The spelling of 662640057 in words is "six hundred sixty-two million, six hundred forty thousand, fifty-seven".