161770025401 has 2 divisors, whose sum is σ = 161770025402. Its totient is φ = 161770025400.

The previous prime is 161770025387. The next prime is 161770025407. The reversal of 161770025401 is 104520077161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95681955625 + 66088069776 = 309325^2 + 257076^2 .

It is a cyclic number.

It is not a de Polignac number, because 161770025401 - 2¹⁵ = 161769992633 is a prime.

It is a super-2 number, since 2×161770025401² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161770025407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80885012700 + 80885012701.

It is an arithmetic number, because the mean of its divisors is an integer number (80885012701).

Almost surely, 2^161770025401 is an apocalyptic number.

It is an amenable number.

161770025401 is a deficient number, since it is larger than the sum of its proper divisors (1).

161770025401 is an equidigital number, since it uses as much as digits as its factorization.

161770025401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 161770025401 in words is "one hundred sixty-one billion, seven hundred seventy million, twenty-five thousand, four hundred one".