163691642880 has 420 divisors, whose sum is σ = 589217373612. Its totient is φ = 43635179520.

The previous prime is 163691642869. The next prime is 163691642953. The reversal of 163691642880 is 88246196361.

It can be written as a sum of positive squares in 2 ways, for example, as 53616328704 + 110075314176 = 231552^2 + 331776^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 59718310 + ... + 59721050.

Almost surely, 2^163691642880 is an apocalyptic number.

163691642880 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 163691642880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294608686806).

163691642880 is an abundant number, since it is smaller than the sum of its proper divisors (425525730732).

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

163691642880 is an frugal number, since it uses more digits than its factorization.

163691642880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792 (or 2751 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 163691642880 in words is "one hundred sixty-three billion, six hundred ninety-one million, six hundred forty-two thousand, eight hundred eighty".