664840074854 has 4 divisors (see below), whose sum is σ = 997260112284. Its totient is φ = 332420037426.

The previous prime is 664840074823. The next prime is 664840074863. The reversal of 664840074854 is 458470048466.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 664840074854.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166210018712 + ... + 166210018715.

It is an arithmetic number, because the mean of its divisors is an integer number (249315028071).

Almost surely, 2^664840074854 is an apocalyptic number.

664840074854 is a deficient number, since it is larger than the sum of its proper divisors (332420037430).

664840074854 is a wasteful number, since it uses less digits than its factorization.

664840074854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332420037429.

The product of its (nonzero) digits is 20643840, while the sum is 56.

The spelling of 664840074854 in words is "six hundred sixty-four billion, eight hundred forty million, seventy-four thousand, eight hundred fifty-four".