221660106523 has 2 divisors, whose sum is σ = 221660106524. Its totient is φ = 221660106522.

The previous prime is 221660106517. The next prime is 221660106529. The reversal of 221660106523 is 325601066122.

It is a balanced prime because it is at equal distance from previous prime (221660106517) and next prime (221660106529).

It is a cyclic number.

It is not a de Polignac number, because 221660106523 - 2⁵ = 221660106491 is a prime.

It is not a weakly prime, because it can be changed into another prime (221660106529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110830053261 + 110830053262.

It is an arithmetic number, because the mean of its divisors is an integer number (110830053262).

Almost surely, 2^221660106523 is an apocalyptic number.

221660106523 is a deficient number, since it is larger than the sum of its proper divisors (1).

221660106523 is an equidigital number, since it uses as much as digits as its factorization.

221660106523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 221660106523 in words is "two hundred twenty-one billion, six hundred sixty million, one hundred six thousand, five hundred twenty-three".