2166070072725 has 36 divisors (see below), whose sum is σ = 4178108501476. Its totient is φ = 1066372957440.

The previous prime is 2166070072679. The next prime is 2166070072739. The reversal of 2166070072725 is 5272700706612.

2166070072725 is a `hidden beast` number, since 2 + 16 + 607 + 0 + 0 + 7 + 2 + 7 + 25 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 69105969 + 2166000966756 = 8313^2 + 1471734^2 .

It is not a de Polignac number, because 2166070072725 - 2⁸ = 2166070072469 is a prime.

It is a super-4 number, since 4×2166070072725⁴ (a number of 50 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 370265464 + ... + 370271313.

Almost surely, 2^{2166070072725} is an apocalyptic number.

2166070072725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2166070072725 is a deficient number, since it is larger than the sum of its proper divisors (2012038428751).

2166070072725 is a wasteful number, since it uses less digits than its factorization.

2166070072725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740536806 (or 740536798 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

The spelling of 2166070072725 in words is "two trillion, one hundred sixty-six billion, seventy million, seventy-two thousand, seven hundred twenty-five".