2166745671450 has 72 divisors (see below), whose sum is σ = 5821854110748. Its totient is φ = 577746167040.

The previous prime is 2166745671371. The next prime is 2166745671463. The reversal of 2166745671450 is 541765476612.

2166745671450 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 74 + 56 + 71 + 450 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 565667947881 + 1601077723569 = 752109^2 + 1265337^2 .

It is a super-2 number, since 2×2166745671450² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4851784 + ... + 5279516.

Almost surely, 2^{2166745671450} is an apocalyptic number.

2166745671450 is an abundant number, since it is smaller than the sum of its proper divisors (3655108439298).

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

2166745671450 is a wasteful number, since it uses less digits than its factorization.

2166745671450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439008 (or 439000 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The spelling of 2166745671450 in words is "two trillion, one hundred sixty-six billion, seven hundred forty-five million, six hundred seventy-one thousand, four hundred fifty".