221661545134157 has 2 divisors, whose sum is σ = 221661545134158. Its totient is φ = 221661545134156.

The previous prime is 221661545134129. The next prime is 221661545134193. The reversal of 221661545134157 is 751431545166122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138664143029476 + 82997402104681 = 11775574^2 + 9110291^2 .

It is a cyclic number.

It is not a de Polignac number, because 221661545134157 - 2²⁴ = 221661528356941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221661545134099 and 221661545134108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221661545134457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110830772567078 + 110830772567079.

It is an arithmetic number, because the mean of its divisors is an integer number (110830772567079).

Almost surely, 2^{221661545134157} is an apocalyptic number.

It is an amenable number.

221661545134157 is a deficient number, since it is larger than the sum of its proper divisors (1).

221661545134157 is an equidigital number, since it uses as much as digits as its factorization.

221661545134157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048000, while the sum is 53.

The spelling of 221661545134157 in words is "two hundred twenty-one trillion, six hundred sixty-one billion, five hundred forty-five million, one hundred thirty-four thousand, one hundred fifty-seven".