651066016681 has 2 divisors, whose sum is σ = 651066016682. Its totient is φ = 651066016680.

The previous prime is 651066016637. The next prime is 651066016693. The reversal of 651066016681 is 186610660156.

651066016681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361531625625 + 289534391056 = 601275^2 + 538084^2 .

It is a cyclic number.

It is not a de Polignac number, because 651066016681 - 2³⁵ = 616706278313 is a prime.

It is a super-2 number, since 2×651066016681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (651066016781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325533008340 + 325533008341.

It is an arithmetic number, because the mean of its divisors is an integer number (325533008341).

Almost surely, 2^651066016681 is an apocalyptic number.

It is an amenable number.

651066016681 is a deficient number, since it is larger than the sum of its proper divisors (1).

651066016681 is an equidigital number, since it uses as much as digits as its factorization.

651066016681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 651066016681 in words is "six hundred fifty-one billion, sixty-six million, sixteen thousand, six hundred eighty-one".