664555888354 has 8 divisors (see below), whose sum is σ = 997879831020. Its totient is φ = 331929278016.

The previous prime is 664555888349. The next prime is 664555888361. The reversal of 664555888354 is 453888555466.

It can be written as a sum of positive squares in 2 ways, for example, as 658650734329 + 5905154025 = 811573^2 + 76845^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×664555888354² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664555888354.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174330699 + ... + 174334510.

Almost surely, 2^664555888354 is an apocalyptic number.

664555888354 is a deficient number, since it is larger than the sum of its proper divisors (333323942666).

664555888354 is a wasteful number, since it uses less digits than its factorization.

664555888354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348666164.

The product of its digits is 552960000, while the sum is 67.

The spelling of 664555888354 in words is "six hundred sixty-four billion, five hundred fifty-five million, eight hundred eighty-eight thousand, three hundred fifty-four".