161651101049953 has 2 divisors, whose sum is σ = 161651101049954. Its totient is φ = 161651101049952.

The previous prime is 161651101049869. The next prime is 161651101049957. The reversal of 161651101049953 is 359940101156161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158476047480529 + 3175053569424 = 12588727^2 + 1781868^2 .

It is a cyclic number.

It is not a de Polignac number, because 161651101049953 - 2¹³ = 161651101041761 is a prime.

It is a super-2 number, since 2×161651101049953² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161651101049953.

It is not a weakly prime, because it can be changed into another prime (161651101049957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80825550524976 + 80825550524977.

It is an arithmetic number, because the mean of its divisors is an integer number (80825550524977).

Almost surely, 2^{161651101049953} is an apocalyptic number.

It is an amenable number.

161651101049953 is a deficient number, since it is larger than the sum of its proper divisors (1).

161651101049953 is an equidigital number, since it uses as much as digits as its factorization.

161651101049953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 874800, while the sum is 52.

The spelling of 161651101049953 in words is "one hundred sixty-one trillion, six hundred fifty-one billion, one hundred one million, forty-nine thousand, nine hundred fifty-three".