651101506661 has 2 divisors, whose sum is σ = 651101506662. Its totient is φ = 651101506660.

The previous prime is 651101506613. The next prime is 651101506667. The reversal of 651101506661 is 166605101156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360607456036 + 290494050625 = 600506^2 + 538975^2 .

It is a cyclic number.

It is not a de Polignac number, because 651101506661 - 2⁶ = 651101506597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651101506667) 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, 325550753330 + 325550753331.

It is an arithmetic number, because the mean of its divisors is an integer number (325550753331).

Almost surely, 2^651101506661 is an apocalyptic number.

It is an amenable number.

651101506661 is a deficient number, since it is larger than the sum of its proper divisors (1).

651101506661 is an equidigital number, since it uses as much as digits as its factorization.

651101506661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 651101506661 in words is "six hundred fifty-one billion, one hundred one million, five hundred six thousand, six hundred sixty-one".