2661216071 has 2 divisors, whose sum is σ = 2661216072. Its totient is φ = 2661216070.

The previous prime is 2661216053. The next prime is 2661216079. The reversal of 2661216071 is 1706121662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2661216071 - 2⁶ = 2661216007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661216079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330608035 + 1330608036.

It is an arithmetic number, because the mean of its divisors is an integer number (1330608036).

Almost surely, 2^2661216071 is an apocalyptic number.

2661216071 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661216071 is an equidigital number, since it uses as much as digits as its factorization.

2661216071 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2661216071 is about 51586.9757884682. The cubic root of 2661216071 is about 1385.7770962592. Note that the first 3 decimals are identical.

The spelling of 2661216071 in words is "two billion, six hundred sixty-one million, two hundred sixteen thousand, seventy-one".