661412546651 has 2 divisors, whose sum is σ = 661412546652. Its totient is φ = 661412546650.

The previous prime is 661412546621. The next prime is 661412546671. The reversal of 661412546651 is 156645214166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661412546651 - 2¹⁴ = 661412530267 is a prime.

It is a super-2 number, since 2×661412546651² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661412546596 and 661412546605.

It is not a weakly prime, because it can be changed into another prime (661412546611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330706273325 + 330706273326.

It is an arithmetic number, because the mean of its divisors is an integer number (330706273326).

Almost surely, 2^661412546651 is an apocalyptic number.

661412546651 is a deficient number, since it is larger than the sum of its proper divisors (1).

661412546651 is an equidigital number, since it uses as much as digits as its factorization.

661412546651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1036800, while the sum is 47.

The spelling of 661412546651 in words is "six hundred sixty-one billion, four hundred twelve million, five hundred forty-six thousand, six hundred fifty-one".