1973694597653 has 2 divisors, whose sum is σ = 1973694597654. Its totient is φ = 1973694597652.

The previous prime is 1973694597643. The next prime is 1973694597697. The reversal of 1973694597653 is 3567954963791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1960218406084 + 13476191569 = 1400078^2 + 116087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1973694597653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1973694597643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986847298826 + 986847298827.

It is an arithmetic number, because the mean of its divisors is an integer number (986847298827).

Almost surely, 2^{1973694597653} is an apocalyptic number.

It is an amenable number.

1973694597653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1973694597653 is an equidigital number, since it uses as much as digits as its factorization.

1973694597653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1157360400, while the sum is 74.

The spelling of 1973694597653 in words is "one trillion, nine hundred seventy-three billion, six hundred ninety-four million, five hundred ninety-seven thousand, six hundred fifty-three".