161011020020122 has 4 divisors (see below), whose sum is σ = 241516530030186. Its totient is φ = 80505510010060.

The previous prime is 161011020020099. The next prime is 161011020020131. The reversal of 161011020020122 is 221020020110161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 159398427345481 + 1612592674641 = 12625309^2 + 1269879^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161011020020122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40252755005029 + ... + 40252755005032.

Almost surely, 2^{161011020020122} is an apocalyptic number.

161011020020122 is a deficient number, since it is larger than the sum of its proper divisors (80505510010064).

161011020020122 is an equidigital number, since it uses as much as digits as its factorization.

161011020020122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80505510010063.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 161011020020122 its reverse (221020020110161), we get a palindrome (382031040130283).

The spelling of 161011020020122 in words is "one hundred sixty-one trillion, eleven billion, twenty million, twenty thousand, one hundred twenty-two".