659544145921 has 2 divisors, whose sum is σ = 659544145922. Its totient is φ = 659544145920.

The previous prime is 659544145901. The next prime is 659544145927. The reversal of 659544145921 is 129541445956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381114849025 + 278429296896 = 617345^2 + 527664^2 .

It is a cyclic number.

It is not a de Polignac number, because 659544145921 - 2⁹ = 659544145409 is a prime.

It is a super-2 number, since 2×659544145921² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (659544145927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329772072960 + 329772072961.

It is an arithmetic number, because the mean of its divisors is an integer number (329772072961).

Almost surely, 2^659544145921 is an apocalyptic number.

It is an amenable number.

659544145921 is a deficient number, since it is larger than the sum of its proper divisors (1).

659544145921 is an equidigital number, since it uses as much as digits as its factorization.

659544145921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776000, while the sum is 55.

The spelling of 659544145921 in words is "six hundred fifty-nine billion, five hundred forty-four million, one hundred forty-five thousand, nine hundred twenty-one".