240166257391609 has 2 divisors, whose sum is σ = 240166257391610. Its totient is φ = 240166257391608.

The previous prime is 240166257391573. The next prime is 240166257391633. The reversal of 240166257391609 is 906193752661042.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227959115839225 + 12207141552384 = 15098315^2 + 3493872^2 .

It is a cyclic number.

It is not a de Polignac number, because 240166257391609 - 2¹⁷ = 240166257260537 is a prime.

It is not a weakly prime, because it can be changed into another prime (240166257391639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120083128695804 + 120083128695805.

It is an arithmetic number, because the mean of its divisors is an integer number (120083128695805).

Almost surely, 2^{240166257391609} is an apocalyptic number.

It is an amenable number.

240166257391609 is a deficient number, since it is larger than the sum of its proper divisors (1).

240166257391609 is an equidigital number, since it uses as much as digits as its factorization.

240166257391609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29393280, while the sum is 61.

The spelling of 240166257391609 in words is "two hundred forty trillion, one hundred sixty-six billion, two hundred fifty-seven million, three hundred ninety-one thousand, six hundred nine".