2166271061 has 4 divisors (see below), whose sum is σ = 2179242912. Its totient is φ = 2153299212.

The previous prime is 2166271057. The next prime is 2166271117. The reversal of 2166271061 is 1601726612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2166271061 - 2² = 2166271057 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 (2166270061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6485675 + ... + 6486008.

It is an arithmetic number, because the mean of its divisors is an integer number (544810728).

Almost surely, 2^2166271061 is an apocalyptic number.

It is an amenable number.

2166271061 is a deficient number, since it is larger than the sum of its proper divisors (12971851).

2166271061 is a wasteful number, since it uses less digits than its factorization.

2166271061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12971850.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 2166271061 is about 46543.2171320376. The cubic root of 2166271061 is about 1293.9105860052.

Adding to 2166271061 its reverse (1601726612), we get a palindrome (3767997673).

The spelling of 2166271061 in words is "two billion, one hundred sixty-six million, two hundred seventy-one thousand, sixty-one".