194644381490 has 32 divisors (see below), whose sum is σ = 381856579776. Its totient is φ = 71002802880.

The previous prime is 194644381487. The next prime is 194644381507. The reversal of 194644381490 is 94183446491.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9008876 + ... + 9030455.

It is an arithmetic number, because the mean of its divisors is an integer number (11933018118).

Almost surely, 2^194644381490 is an apocalyptic number.

194644381490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

194644381490 is a deficient number, since it is larger than the sum of its proper divisors (187212198286).

194644381490 is a wasteful number, since it uses less digits than its factorization.

194644381490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18039434.

The product of its (nonzero) digits is 2985984, while the sum is 53.

The spelling of 194644381490 in words is "one hundred ninety-four billion, six hundred forty-four million, three hundred eighty-one thousand, four hundred ninety".