161513351641 has 2 divisors, whose sum is σ = 161513351642. Its totient is φ = 161513351640.

The previous prime is 161513351621. The next prime is 161513351653. The reversal of 161513351641 is 146153315161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161259268041 + 254083600 = 401571^2 + 15940^2 .

It is a cyclic number.

It is not a de Polignac number, because 161513351641 - 2¹³ = 161513343449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161513351641.

It is not a weakly prime, because it can be changed into another prime (161513351621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80756675820 + 80756675821.

It is an arithmetic number, because the mean of its divisors is an integer number (80756675821).

Almost surely, 2^161513351641 is an apocalyptic number.

It is an amenable number.

161513351641 is a deficient number, since it is larger than the sum of its proper divisors (1).

161513351641 is an equidigital number, since it uses as much as digits as its factorization.

161513351641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The spelling of 161513351641 in words is "one hundred sixty-one billion, five hundred thirteen million, three hundred fifty-one thousand, six hundred forty-one".