1326774661 has 2 divisors, whose sum is σ = 1326774662. Its totient is φ = 1326774660.

The previous prime is 1326774623. The next prime is 1326774721. The reversal of 1326774661 is 1664776231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1310005636 + 16769025 = 36194^2 + 4095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1326774661 - 2⁹ = 1326774149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1326774961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663387330 + 663387331.

It is an arithmetic number, because the mean of its divisors is an integer number (663387331).

Almost surely, 2^1326774661 is an apocalyptic number.

It is an amenable number.

1326774661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1326774661 is an equidigital number, since it uses as much as digits as its factorization.

1326774661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 43.

The square root of 1326774661 is about 36424.9181330583. The cubic root of 1326774661 is about 1098.8347608542.

The spelling of 1326774661 in words is "one billion, three hundred twenty-six million, seven hundred seventy-four thousand, six hundred sixty-one".