2166000212501 has 8 divisors (see below), whose sum is σ = 2166662029464. Its totient is φ = 2165338501120.

The previous prime is 2166000212491. The next prime is 2166000212503. The reversal of 2166000212501 is 1052120006612.

It can be written as a sum of positive squares in 4 ways, for example, as 892408966276 + 1273591246225 = 944674^2 + 1128535^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166000212501 - 2⁶ = 2166000212437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166000212503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59920505 + ... + 59956641.

It is an arithmetic number, because the mean of its divisors is an integer number (270832753683).

Almost surely, 2^{2166000212501} is an apocalyptic number.

It is an amenable number.

2166000212501 is a deficient number, since it is larger than the sum of its proper divisors (661816963).

2166000212501 is a wasteful number, since it uses less digits than its factorization.

2166000212501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52791.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 2166000212501 in words is "two trillion, one hundred sixty-six billion, two hundred twelve thousand, five hundred one".