651065115661 has 2 divisors, whose sum is σ = 651065115662. Its totient is φ = 651065115660.

The previous prime is 651065115611. The next prime is 651065115683. The reversal of 651065115661 is 166511560156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 422766542025 + 228298573636 = 650205^2 + 477806^2 .

It is a cyclic number.

It is not a de Polignac number, because 651065115661 - 2²¹ = 651063018509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651065115611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325532557830 + 325532557831.

It is an arithmetic number, because the mean of its divisors is an integer number (325532557831).

Almost surely, 2^651065115661 is an apocalyptic number.

It is an amenable number.

651065115661 is a deficient number, since it is larger than the sum of its proper divisors (1).

651065115661 is an equidigital number, since it uses as much as digits as its factorization.

651065115661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 651065115661 in words is "six hundred fifty-one billion, sixty-five million, one hundred fifteen thousand, six hundred sixty-one".