166787977140 has 144 divisors (see below), whose sum is σ = 531418358016. Its totient is φ = 42261120000.

The previous prime is 166787977127. The next prime is 166787977157. The reversal of 166787977140 is 41779787661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 491740 + ... + 758540.

It is an arithmetic number, because the mean of its divisors is an integer number (3690405264).

Almost surely, 2^166787977140 is an apocalyptic number.

166787977140 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 166787977140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265709179008).

166787977140 is an abundant number, since it is smaller than the sum of its proper divisors (364630380876).

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

166787977140 is a wasteful number, since it uses less digits than its factorization.

166787977140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266990 (or 266985 counting only the distinct ones).

The product of its (nonzero) digits is 24893568, while the sum is 63.

The spelling of 166787977140 in words is "one hundred sixty-six billion, seven hundred eighty-seven million, nine hundred seventy-seven thousand, one hundred forty".