65161801 has 2 divisors, whose sum is σ = 65161802. Its totient is φ = 65161800.

The previous prime is 65161777. The next prime is 65161819. The reversal of 65161801 is 10816156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59305401 + 5856400 = 7701^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 65161801 - 2⁵ = 65161769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65161801.

It is not a weakly prime, because it can be changed into another prime (65161861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32580900 + 32580901.

It is an arithmetic number, because the mean of its divisors is an integer number (32580901).

Almost surely, 2^65161801 is an apocalyptic number.

It is an amenable number.

65161801 is a deficient number, since it is larger than the sum of its proper divisors (1).

65161801 is an equidigital number, since it uses as much as digits as its factorization.

65161801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 65161801 is about 8072.2859835365. The cubic root of 65161801 is about 402.4059186253.

Adding to 65161801 its reverse (10816156), we get a palindrome (75977957).

The spelling of 65161801 in words is "sixty-five million, one hundred sixty-one thousand, eight hundred one".