1997077712393 has 2 divisors, whose sum is σ = 1997077712394. Its totient is φ = 1997077712392.

The previous prime is 1997077712381. The next prime is 1997077712429. The reversal of 1997077712393 is 3932177707991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155478804624 + 841598907769 = 1074932^2 + 917387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1997077712393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1997077712303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998538856196 + 998538856197.

It is an arithmetic number, because the mean of its divisors is an integer number (998538856197).

Almost surely, 2^{1997077712393} is an apocalyptic number.

It is an amenable number.

1997077712393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997077712393 is an equidigital number, since it uses as much as digits as its factorization.

1997077712393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31505922, while the sum is 65.

The spelling of 1997077712393 in words is "one trillion, nine hundred ninety-seven billion, seventy-seven million, seven hundred twelve thousand, three hundred ninety-three".