402150644561 has 2 divisors, whose sum is σ = 402150644562. Its totient is φ = 402150644560.

The previous prime is 402150644509. The next prime is 402150644563. The reversal of 402150644561 is 165446051204.

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., 389227502161 + 12923142400 = 623881^2 + 113680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402150644561 is a prime.

Together with 402150644563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (402150644563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201075322280 + 201075322281.

It is an arithmetic number, because the mean of its divisors is an integer number (201075322281).

Almost surely, 2^402150644561 is an apocalyptic number.

It is an amenable number.

402150644561 is a deficient number, since it is larger than the sum of its proper divisors (1).

402150644561 is an equidigital number, since it uses as much as digits as its factorization.

402150644561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 38.

Adding to 402150644561 its reverse (165446051204), we get a palindrome (567596695765).

The spelling of 402150644561 in words is "four hundred two billion, one hundred fifty million, six hundred forty-four thousand, five hundred sixty-one".