2153665770691 has 2 divisors, whose sum is σ = 2153665770692. Its totient is φ = 2153665770690.

The previous prime is 2153665770679. The next prime is 2153665770721. The reversal of 2153665770691 is 1960775663512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2153665770691 is a prime.

It is not a weakly prime, because it can be changed into another prime (2153665770631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076832885345 + 1076832885346.

It is an arithmetic number, because the mean of its divisors is an integer number (1076832885346).

Almost surely, 2^{2153665770691} is an apocalyptic number.

2153665770691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153665770691 is an equidigital number, since it uses as much as digits as its factorization.

2153665770691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14288400, while the sum is 58.

The spelling of 2153665770691 in words is "two trillion, one hundred fifty-three billion, six hundred sixty-five million, seven hundred seventy thousand, six hundred ninety-one".