163978577280 has 1792 divisors, whose sum is σ = 732061670400. Its totient is φ = 34291040256.

The previous prime is 163978577233. The next prime is 163978577299. The reversal of 163978577280 is 82775879361.

163978577280 is a `hidden beast` number, since 1 + 6 + 39 + 7 + 8 + 577 + 28 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 2779297891 + ... + 2779297949.

Almost surely, 2^163978577280 is an apocalyptic number.

163978577280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163978577280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (366030835200).

163978577280 is an abundant number, since it is smaller than the sum of its proper divisors (568083093120).

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

163978577280 is an equidigital number, since it uses as much as digits as its factorization.

163978577280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 35562240, while the sum is 63.

The spelling of 163978577280 in words is "one hundred sixty-three billion, nine hundred seventy-eight million, five hundred seventy-seven thousand, two hundred eighty".