2166613251364 has 27 divisors (see below), whose sum is σ = 3917992478673. Its totient is φ = 1048317092400.

The previous prime is 2166613251259. The next prime is 2166613251367. The reversal of 2166613251364 is 4631523166612.

The square root of 2166613251364 is 1471942.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2157496820964 + 9116430400 = 1468842^2 + 95480^2 .

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166613251367) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 91248534 + ... + 91272274.

Almost surely, 2^{2166613251364} is an apocalyptic number.

2166613251364 is the 1471942-nd square number.

It is an amenable number.

2166613251364 is a deficient number, since it is larger than the sum of its proper divisors (1751379227309).

2166613251364 is an frugal number, since it uses more digits than its factorization.

2166613251364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47548 (or 23774 counting only the distinct ones).

The product of its digits is 933120, while the sum is 46.

The spelling of 2166613251364 in words is "two trillion, one hundred sixty-six billion, six hundred thirteen million, two hundred fifty-one thousand, three hundred sixty-four".