381911937664 has 16 divisors (see below), whose sum is σ = 760840188570. Its totient is φ = 190955968768.

The previous prime is 381911937661. The next prime is 381911937677. The reversal of 381911937664 is 466739119183.

It can be written as a sum of positive squares in only one way, i.e., 191808961600 + 190102976064 = 437960^2 + 436008^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 381911937599 and 381911937608.

It is not an unprimeable number, because it can be changed into a prime (381911937661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1491843379 + ... + 1491843634.

Almost surely, 2^381911937664 is an apocalyptic number.

It is an amenable number.

381911937664 is a deficient number, since it is larger than the sum of its proper divisors (378928250906).

381911937664 is an equidigital number, since it uses as much as digits as its factorization.

381911937664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983687027 (or 2983687015 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 58.

The spelling of 381911937664 in words is "three hundred eighty-one billion, nine hundred eleven million, nine hundred thirty-seven thousand, six hundred sixty-four".