681909070209053 has 2 divisors, whose sum is σ = 681909070209054. Its totient is φ = 681909070209052.

The previous prime is 681909070208969. The next prime is 681909070209061. The reversal of 681909070209053 is 350902070909186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 425051328933529 + 256857741275524 = 20616773^2 + 16026782^2 .

It is a cyclic number.

It is not a de Polignac number, because 681909070209053 - 2¹⁰ = 681909070208029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681909070208983 and 681909070209001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681909070200053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340954535104526 + 340954535104527.

It is an arithmetic number, because the mean of its divisors is an integer number (340954535104527).

Almost surely, 2^{681909070209053} is an apocalyptic number.

It is an amenable number.

681909070209053 is a deficient number, since it is larger than the sum of its proper divisors (1).

681909070209053 is an equidigital number, since it uses as much as digits as its factorization.

681909070209053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7348320, while the sum is 59.

The spelling of 681909070209053 in words is "six hundred eighty-one trillion, nine hundred nine billion, seventy million, two hundred nine thousand, fifty-three".