65170837661 has 2 divisors, whose sum is σ = 65170837662. Its totient is φ = 65170837660.

The previous prime is 65170837651. The next prime is 65170837681. The reversal of 65170837661 is 16673807156.

65170837661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65007151225 + 163686436 = 254965^2 + 12794^2 .

It is a cyclic number.

It is not a de Polignac number, because 65170837661 - 2⁶ = 65170837597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65170837621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32585418830 + 32585418831.

It is an arithmetic number, because the mean of its divisors is an integer number (32585418831).

Almost surely, 2^65170837661 is an apocalyptic number.

It is an amenable number.

65170837661 is a deficient number, since it is larger than the sum of its proper divisors (1).

65170837661 is an equidigital number, since it uses as much as digits as its factorization.

65170837661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 65170837661 in words is "sixty-five billion, one hundred seventy million, eight hundred thirty-seven thousand, six hundred sixty-one".