2191680691153 has 2 divisors, whose sum is σ = 2191680691154. Its totient is φ = 2191680691152.

The previous prime is 2191680691139. The next prime is 2191680691201. The reversal of 2191680691153 is 3511960861912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2185347237264 + 6333453889 = 1478292^2 + 79583^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191680691153 - 2⁵ = 2191680691121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2191680691153.

It is not a weakly prime, because it can be changed into another prime (2191680691103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095840345576 + 1095840345577.

It is an arithmetic number, because the mean of its divisors is an integer number (1095840345577).

Almost surely, 2^{2191680691153} is an apocalyptic number.

It is an amenable number.

2191680691153 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191680691153 is an equidigital number, since it uses as much as digits as its factorization.

2191680691153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 52.

The spelling of 2191680691153 in words is "two trillion, one hundred ninety-one billion, six hundred eighty million, six hundred ninety-one thousand, one hundred fifty-three".