221646257672977 has 2 divisors, whose sum is σ = 221646257672978. Its totient is φ = 221646257672976.

The previous prime is 221646257672971. The next prime is 221646257673077. The reversal of 221646257672977 is 779276752646122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218441187419536 + 3205070253441 = 14779756^2 + 1790271^2 .

It is a cyclic number.

It is not a de Polignac number, because 221646257672977 - 2³¹ = 221644110189329 is a prime.

It is not a weakly prime, because it can be changed into another prime (221646257672971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110823128836488 + 110823128836489.

It is an arithmetic number, because the mean of its divisors is an integer number (110823128836489).

Almost surely, 2^{221646257672977} is an apocalyptic number.

It is an amenable number.

221646257672977 is a deficient number, since it is larger than the sum of its proper divisors (1).

221646257672977 is an equidigital number, since it uses as much as digits as its factorization.

221646257672977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1493614080, while the sum is 73.

The spelling of 221646257672977 in words is "two hundred twenty-one trillion, six hundred forty-six billion, two hundred fifty-seven million, six hundred seventy-two thousand, nine hundred seventy-seven".