664838481451 has 4 divisors (see below), whose sum is σ = 664845158152. Its totient is φ = 664831804752.

The previous prime is 664838481449. The next prime is 664838481467. The reversal of 664838481451 is 154184838466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664838481451 - 2¹ = 664838481449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664838481431) 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, 3186690 + ... + 3388903.

It is an arithmetic number, because the mean of its divisors is an integer number (166211289538).

Almost surely, 2^664838481451 is an apocalyptic number.

664838481451 is a deficient number, since it is larger than the sum of its proper divisors (6676701).

664838481451 is a wasteful number, since it uses less digits than its factorization.

664838481451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6676700.

The product of its digits is 17694720, while the sum is 58.

The spelling of 664838481451 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, four hundred eighty-one thousand, four hundred fifty-one".