664666451077 has 4 divisors (see below), whose sum is σ = 664668747820. Its totient is φ = 664664154336.

The previous prime is 664666450999. The next prime is 664666451083. The reversal of 664666451077 is 770154666466.

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 370849332676 + 293817118401 = 608974^2 + 542049^2 .

It is a cyclic number.

It is not a de Polignac number, because 664666451077 - 2²³ = 664658062469 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 (664666451177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638952 + ... + 1318177.

It is an arithmetic number, because the mean of its divisors is an integer number (166167186955).

Almost surely, 2^664666451077 is an apocalyptic number.

It is an amenable number.

664666451077 is a deficient number, since it is larger than the sum of its proper divisors (2296743).

664666451077 is a wasteful number, since it uses less digits than its factorization.

664666451077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296742.

The product of its (nonzero) digits is 30481920, while the sum is 58.

The spelling of 664666451077 in words is "six hundred sixty-four billion, six hundred sixty-six million, four hundred fifty-one thousand, seventy-seven".