381318646564 has 6 divisors (see below), whose sum is σ = 667307631494. Its totient is φ = 190659323280.

The previous prime is 381318646529. The next prime is 381318646609. The reversal of 381318646564 is 465646813183.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 376848654400 + 4469992164 = 613880^2 + 66858^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47664830817 + ... + 47664830824.

Almost surely, 2^381318646564 is an apocalyptic number.

It is an amenable number.

381318646564 is a deficient number, since it is larger than the sum of its proper divisors (285988984930).

381318646564 is a wasteful number, since it uses less digits than its factorization.

381318646564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95329661645 (or 95329661643 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 55.

The spelling of 381318646564 in words is "three hundred eighty-one billion, three hundred eighteen million, six hundred forty-six thousand, five hundred sixty-four".