1597067212661 has 2 divisors, whose sum is σ = 1597067212662. Its totient is φ = 1597067212660.

The previous prime is 1597067212649. The next prime is 1597067212711. The reversal of 1597067212661 is 1662127607951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1411745572561 + 185321640100 = 1188169^2 + 430490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1597067212661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1597067212561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 798533606330 + 798533606331.

It is an arithmetic number, because the mean of its divisors is an integer number (798533606331).

Almost surely, 2^{1597067212661} is an apocalyptic number.

It is an amenable number.

1597067212661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1597067212661 is an equidigital number, since it uses as much as digits as its factorization.

1597067212661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The spelling of 1597067212661 in words is "one trillion, five hundred ninety-seven billion, sixty-seven million, two hundred twelve thousand, six hundred sixty-one".