165064601861 has 2 divisors, whose sum is σ = 165064601862. Its totient is φ = 165064601860.

The previous prime is 165064601789. The next prime is 165064601879. The reversal of 165064601861 is 168106460561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159755293636 + 5309308225 = 399694^2 + 72865^2 .

It is a cyclic number.

It is not a de Polignac number, because 165064601861 - 2¹⁸ = 165064339717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165064600861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82532300930 + 82532300931.

It is an arithmetic number, because the mean of its divisors is an integer number (82532300931).

Almost surely, 2^165064601861 is an apocalyptic number.

It is an amenable number.

165064601861 is a deficient number, since it is larger than the sum of its proper divisors (1).

165064601861 is an equidigital number, since it uses as much as digits as its factorization.

165064601861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 165064601861 in words is "one hundred sixty-five billion, sixty-four million, six hundred one thousand, eight hundred sixty-one".