2166661347 has 16 divisors (see below), whose sum is σ = 2966676480. Its totient is φ = 1406059200.

The previous prime is 2166661337. The next prime is 2166661361. The reversal of 2166661347 is 7431666612.

It is not a de Polignac number, because 2166661347 - 2⁶ = 2166661283 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2166661299 and 2166661308.

It is not an unprimeable number, because it can be changed into a prime (2166661327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47554 + ... + 81207.

It is an arithmetic number, because the mean of its divisors is an integer number (185417280).

Almost surely, 2^2166661347 is an apocalyptic number.

2166661347 is a deficient number, since it is larger than the sum of its proper divisors (800015133).

2166661347 is a wasteful number, since it uses less digits than its factorization.

2166661347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128914.

The product of its digits is 217728, while the sum is 42.

The square root of 2166661347 is about 46547.4096701417. The cubic root of 2166661347 is about 1293.9882870944.

The spelling of 2166661347 in words is "two billion, one hundred sixty-six million, six hundred sixty-one thousand, three hundred forty-seven".