664841403766 has 16 divisors (see below), whose sum is σ = 1013665152528. Its totient is φ = 326953605600.

The previous prime is 664841403757. The next prime is 664841403799. The reversal of 664841403766 is 667304148466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2298996 + ... + 2571976.

It is an arithmetic number, because the mean of its divisors is an integer number (63354072033).

Almost surely, 2^664841403766 is an apocalyptic number.

664841403766 is a deficient number, since it is larger than the sum of its proper divisors (348823748762).

664841403766 is a wasteful number, since it uses less digits than its factorization.

664841403766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293007.

The product of its (nonzero) digits is 13934592, while the sum is 55.

The spelling of 664841403766 in words is "six hundred sixty-four billion, eight hundred forty-one million, four hundred three thousand, seven hundred sixty-six".