651402460561 has 2 divisors, whose sum is σ = 651402460562. Its totient is φ = 651402460560.

The previous prime is 651402460547. The next prime is 651402460607. The reversal of 651402460561 is 165064204156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 650029387536 + 1373073025 = 806244^2 + 37055^2 .

It is a cyclic number.

It is not a de Polignac number, because 651402460561 - 2⁵ = 651402460529 is a prime.

It is not a weakly prime, because it can be changed into another prime (651402460661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325701230280 + 325701230281.

It is an arithmetic number, because the mean of its divisors is an integer number (325701230281).

Almost surely, 2^651402460561 is an apocalyptic number.

It is an amenable number.

651402460561 is a deficient number, since it is larger than the sum of its proper divisors (1).

651402460561 is an equidigital number, since it uses as much as digits as its factorization.

651402460561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 651402460561 in words is "six hundred fifty-one billion, four hundred two million, four hundred sixty thousand, five hundred sixty-one".