381781666242 has 24 divisors (see below), whose sum is σ = 827206338816. Its totient is φ = 127258597176.

The previous prime is 381781666229. The next prime is 381781666249. The reversal of 381781666242 is 242666187183.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (381781666249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1493803 + ... + 1730609.

It is an arithmetic number, because the mean of its divisors is an integer number (34466930784).

Almost surely, 2^381781666242 is an apocalyptic number.

381781666242 is an abundant number, since it is smaller than the sum of its proper divisors (445424672574).

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

381781666242 is a wasteful number, since it uses less digits than its factorization.

381781666242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326382 (or 326379 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 381781666242 in words is "three hundred eighty-one billion, seven hundred eighty-one million, six hundred sixty-six thousand, two hundred forty-two".