221155077652697 has 2 divisors, whose sum is σ = 221155077652698. Its totient is φ = 221155077652696.

The previous prime is 221155077652693. The next prime is 221155077652711. The reversal of 221155077652697 is 796256770551122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179138442516121 + 42016635136576 = 13384261^2 + 6482024^2 .

It is a cyclic number.

It is not a de Polignac number, because 221155077652697 - 2² = 221155077652693 is a prime.

It is a super-2 number, since 2×221155077652697² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221155077652693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110577538826348 + 110577538826349.

It is an arithmetic number, because the mean of its divisors is an integer number (110577538826349).

Almost surely, 2^{221155077652697} is an apocalyptic number.

It is an amenable number.

221155077652697 is a deficient number, since it is larger than the sum of its proper divisors (1).

221155077652697 is an equidigital number, since it uses as much as digits as its factorization.

221155077652697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111132000, while the sum is 65.

The spelling of 221155077652697 in words is "two hundred twenty-one trillion, one hundred fifty-five billion, seventy-seven million, six hundred fifty-two thousand, six hundred ninety-seven".