2166906972 has 36 divisors (see below), whose sum is σ = 5371038680. Its totient is φ = 679812864.

The previous prime is 2166906899. The next prime is 2166906977. The reversal of 2166906972 is 2796096612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166906977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308947 + ... + 315882.

Almost surely, 2^2166906972 is an apocalyptic number.

It is an amenable number.

2166906972 is an abundant number, since it is smaller than the sum of its proper divisors (3204131708).

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

2166906972 is a wasteful number, since it uses less digits than its factorization.

2166906972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624870 (or 624851 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 2166906972 is about 46550.0480343469. The cubic root of 2166906972 is about 1294.0371831934.

The spelling of 2166906972 in words is "two billion, one hundred sixty-six million, nine hundred six thousand, nine hundred seventy-two".