154652664201221 has 2 divisors, whose sum is σ = 154652664201222. Its totient is φ = 154652664201220.

The previous prime is 154652664201173. The next prime is 154652664201239. The reversal of 154652664201221 is 122102466256451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119681171332321 + 34971492868900 = 10939889^2 + 5913670^2 .

It is a cyclic number.

It is not a de Polignac number, because 154652664201221 - 2⁴² = 150254617690117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154652663201221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77326332100610 + 77326332100611.

It is an arithmetic number, because the mean of its divisors is an integer number (77326332100611).

Almost surely, 2^{154652664201221} is an apocalyptic number.

It is an amenable number.

154652664201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

154652664201221 is an equidigital number, since it uses as much as digits as its factorization.

154652664201221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1382400, while the sum is 47.

The spelling of 154652664201221 in words is "one hundred fifty-four trillion, six hundred fifty-two billion, six hundred sixty-four million, two hundred one thousand, two hundred twenty-one".