651155160661 has 2 divisors, whose sum is σ = 651155160662. Its totient is φ = 651155160660.

The previous prime is 651155160659. The next prime is 651155160703. The reversal of 651155160661 is 166061551156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 637203062500 + 13952098161 = 798250^2 + 118119^2 .

It is a cyclic number.

It is not a de Polignac number, because 651155160661 - 2¹ = 651155160659 is a prime.

Together with 651155160659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651155164661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325577580330 + 325577580331.

It is an arithmetic number, because the mean of its divisors is an integer number (325577580331).

Almost surely, 2^651155160661 is an apocalyptic number.

It is an amenable number.

651155160661 is a deficient number, since it is larger than the sum of its proper divisors (1).

651155160661 is an equidigital number, since it uses as much as digits as its factorization.

651155160661 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 651155160661 in words is "six hundred fifty-one billion, one hundred fifty-five million, one hundred sixty thousand, six hundred sixty-one".