381299996550 has 96 divisors (see below), whose sum is σ = 1032797361024. Its totient is φ = 92328160000.

The previous prime is 381299996543. The next prime is 381299996551. The reversal of 381299996550 is 55699992183.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381299996551) by changing a digit.

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 in 47 ways as a sum of consecutive naturals, for example, 1279225 + ... + 1548875.

It is an arithmetic number, because the mean of its divisors is an integer number (10758305844).

Almost surely, 2^381299996550 is an apocalyptic number.

381299996550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 381299996550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (516398680512).

381299996550 is an abundant number, since it is smaller than the sum of its proper divisors (651497364474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381299996550 is a wasteful number, since it uses less digits than its factorization.

381299996550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270534 (or 270529 counting only the distinct ones).

The product of its (nonzero) digits is 47239200, while the sum is 66.

The spelling of 381299996550 in words is "three hundred eighty-one billion, two hundred ninety-nine million, nine hundred ninety-six thousand, five hundred fifty".