161510055001 has 2 divisors, whose sum is σ = 161510055002. Its totient is φ = 161510055000.

The previous prime is 161510054983. The next prime is 161510055103. The reversal of 161510055001 is 100550015161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138994752400 + 22515302601 = 372820^2 + 150051^2 .

It is a cyclic number.

It is not a de Polignac number, because 161510055001 - 2¹⁹ = 161509530713 is a prime.

It is a super-2 number, since 2×161510055001² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161510055401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80755027500 + 80755027501.

It is an arithmetic number, because the mean of its divisors is an integer number (80755027501).

Almost surely, 2^161510055001 is an apocalyptic number.

It is an amenable number.

161510055001 is a deficient number, since it is larger than the sum of its proper divisors (1).

161510055001 is an equidigital number, since it uses as much as digits as its factorization.

161510055001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 25.

The spelling of 161510055001 in words is "one hundred sixty-one billion, five hundred ten million, fifty-five thousand, one".