163881566390 has 8 divisors (see below), whose sum is σ = 294986819520. Its totient is φ = 65552626552.

The previous prime is 163881566377. The next prime is 163881566411. The reversal of 163881566390 is 93665188361.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×163881566390³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8194078310 + ... + 8194078329.

It is an arithmetic number, because the mean of its divisors is an integer number (36873352440).

Almost surely, 2^163881566390 is an apocalyptic number.

163881566390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163881566390 is a deficient number, since it is larger than the sum of its proper divisors (131105253130).

163881566390 is a wasteful number, since it uses less digits than its factorization.

163881566390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16388156646.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 163881566390 in words is "one hundred sixty-three billion, eight hundred eighty-one million, five hundred sixty-six thousand, three hundred ninety".