10120765661 has 2 divisors, whose sum is σ = 10120765662. Its totient is φ = 10120765660.

The previous prime is 10120765657. The next prime is 10120765687. The reversal of 10120765661 is 16656702101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5133722500 + 4987043161 = 71650^2 + 70619^2 .

It is a cyclic number.

It is not a de Polignac number, because 10120765661 - 2² = 10120765657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10120765631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060382830 + 5060382831.

It is an arithmetic number, because the mean of its divisors is an integer number (5060382831).

Almost surely, 2^10120765661 is an apocalyptic number.

It is an amenable number.

10120765661 is a deficient number, since it is larger than the sum of its proper divisors (1).

10120765661 is an equidigital number, since it uses as much as digits as its factorization.

10120765661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 10120765661 in words is "ten billion, one hundred twenty million, seven hundred sixty-five thousand, six hundred sixty-one".