221667766097 has 2 divisors, whose sum is σ = 221667766098. Its totient is φ = 221667766096.

The previous prime is 221667766081. The next prime is 221667766129. The reversal of 221667766097 is 790667766122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114081142081 + 107586624016 = 337759^2 + 328004^2 .

It is a cyclic number.

It is not a de Polignac number, because 221667766097 - 2⁴ = 221667766081 is a prime.

It is a super-2 number, since 2×221667766097² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221667766027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110833883048 + 110833883049.

It is an arithmetic number, because the mean of its divisors is an integer number (110833883049).

Almost surely, 2^221667766097 is an apocalyptic number.

It is an amenable number.

221667766097 is a deficient number, since it is larger than the sum of its proper divisors (1).

221667766097 is an equidigital number, since it uses as much as digits as its factorization.

221667766097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16003008, while the sum is 59.

The spelling of 221667766097 in words is "two hundred twenty-one billion, six hundred sixty-seven million, seven hundred sixty-six thousand, ninety-seven".