2194965864 has 160 divisors (see below), whose sum is σ = 7566894720. Its totient is φ = 578876544.

The previous prime is 2194965859. The next prime is 2194965907. The reversal of 2194965864 is 4685694912.

2194965864 is a `hidden beast` number, since 2 + 19 + 49 + 6 + 586 + 4 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2194965864.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 40357 + ... + 77579.

It is an arithmetic number, because the mean of its divisors is an integer number (47293092).

Almost surely, 2^2194965864 is an apocalyptic number.

2194965864 is a gapful number since it is divisible by the number (24) 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 2194965864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3783447360).

2194965864 is an abundant number, since it is smaller than the sum of its proper divisors (5371928856).

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

2194965864 is a wasteful number, since it uses less digits than its factorization.

2194965864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37261 (or 37248 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 2194965864 is about 46850.4627938722. The cubic root of 2194965864 is about 1299.5986658570.

The spelling of 2194965864 in words is "two billion, one hundred ninety-four million, nine hundred sixty-five thousand, eight hundred sixty-four".