1373757782561 has 2 divisors, whose sum is σ = 1373757782562. Its totient is φ = 1373757782560.

The previous prime is 1373757782557. The next prime is 1373757782713. The reversal of 1373757782561 is 1652877573731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988155283600 + 385602498961 = 994060^2 + 620969^2 .

It is a cyclic number.

It is not a de Polignac number, because 1373757782561 - 2² = 1373757782557 is a prime.

It is a super-3 number, since 3×1373757782561³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1373757782494 and 1373757782503.

It is not a weakly prime, because it can be changed into another prime (1373750782561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686878891280 + 686878891281.

It is an arithmetic number, because the mean of its divisors is an integer number (686878891281).

Almost surely, 2^{1373757782561} is an apocalyptic number.

It is an amenable number.

1373757782561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1373757782561 is an equidigital number, since it uses as much as digits as its factorization.

1373757782561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51861600, while the sum is 62.

The spelling of 1373757782561 in words is "one trillion, three hundred seventy-three billion, seven hundred fifty-seven million, seven hundred eighty-two thousand, five hundred sixty-one".