664838672377 has 16 divisors (see below), whose sum is σ = 727360785792. Its totient is φ = 602665989120.

The previous prime is 664838672341. The next prime is 664838672389. The reversal of 664838672377 is 773276838466.

It is a cyclic number.

It is not a de Polignac number, because 664838672377 - 2¹⁵ = 664838639609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664838672317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5570743 + ... + 5688835.

It is an arithmetic number, because the mean of its divisors is an integer number (45460049112).

Almost surely, 2^664838672377 is an apocalyptic number.

It is an amenable number.

664838672377 is a deficient number, since it is larger than the sum of its proper divisors (62522113415).

664838672377 is a wasteful number, since it uses less digits than its factorization.

664838672377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119568.

The product of its digits is 341397504, while the sum is 67.

The spelling of 664838672377 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, six hundred seventy-two thousand, three hundred seventy-seven".