2166906480 has 80 divisors (see below), whose sum is σ = 6898989984. Its totient is φ = 562222080.

The previous prime is 2166906463. The next prime is 2166906493. The reversal of 2166906480 is 846096612.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×2166906480³ (a number of 29 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 15 ways as a sum of consecutive naturals, for example, 113131 + ... + 130890.

Almost surely, 2^2166906480 is an apocalyptic number.

2166906480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166906480 is an abundant number, since it is smaller than the sum of its proper divisors (4732083504).

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

2166906480 is a wasteful number, since it uses less digits than its factorization.

2166906480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244074 (or 244068 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 2166906480 is about 46550.0427497118. The cubic root of 2166906480 is about 1294.0370852556.

The spelling of 2166906480 in words is "two billion, one hundred sixty-six million, nine hundred six thousand, four hundred eighty".