163904646390 has 64 divisors (see below), whose sum is σ = 395156399616. Its totient is φ = 43509768192.

The previous prime is 163904646383. The next prime is 163904646401. The reversal of 163904646390 is 93646409361.

163904646390 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-6 number, since 6×163904646390⁶ (a number of 69 digits) contains 666666 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13740969 + ... + 13752891.

It is an arithmetic number, because the mean of its divisors is an integer number (6174318744).

Almost surely, 2^163904646390 is an apocalyptic number.

163904646390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163904646390 is an abundant number, since it is smaller than the sum of its proper divisors (231251753226).

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

163904646390 is a wasteful number, since it uses less digits than its factorization.

163904646390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13973.

The product of its (nonzero) digits is 2519424, while the sum is 51.

The spelling of 163904646390 in words is "one hundred sixty-three billion, nine hundred four million, six hundred forty-six thousand, three hundred ninety".