2156774466 has 64 divisors (see below), whose sum is σ = 5389203456. Its totient is φ = 559027200.

The previous prime is 2156774453. The next prime is 2156774467. The reversal of 2156774466 is 6644776512.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2156774467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227746 + ... + 237026.

It is an arithmetic number, because the mean of its divisors is an integer number (84206304).

Almost surely, 2^2156774466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156774466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2694601728).

2156774466 is an abundant number, since it is smaller than the sum of its proper divisors (3232428990).

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

2156774466 is a wasteful number, since it uses less digits than its factorization.

2156774466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9807.

The product of its digits is 1693440, while the sum is 48.

The square root of 2156774466 is about 46441.0859692148. The cubic root of 2156774466 is about 1292.0170488058.

The spelling of 2156774466 in words is "two billion, one hundred fifty-six million, seven hundred seventy-four thousand, four hundred sixty-six".