361999640489 has 2 divisors, whose sum is σ = 361999640490. Its totient is φ = 361999640488.

The previous prime is 361999640473. The next prime is 361999640531. The reversal of 361999640489 is 984046999163.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 355314942889 + 6684697600 = 596083^2 + 81760^2 .

It is an emirp because it is prime and its reverse (984046999163) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 361999640489 - 2⁴ = 361999640473 is a prime.

It is not a weakly prime, because it can be changed into another prime (361999670489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180999820244 + 180999820245.

It is an arithmetic number, because the mean of its divisors is an integer number (180999820245).

Almost surely, 2^361999640489 is an apocalyptic number.

It is an amenable number.

361999640489 is a deficient number, since it is larger than the sum of its proper divisors (1).

361999640489 is an equidigital number, since it uses as much as digits as its factorization.

361999640489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90699264, while the sum is 68.

The spelling of 361999640489 in words is "three hundred sixty-one billion, nine hundred ninety-nine million, six hundred forty thousand, four hundred eighty-nine".