699691382561 has 2 divisors, whose sum is σ = 699691382562. Its totient is φ = 699691382560.

The previous prime is 699691382549. The next prime is 699691382587. The reversal of 699691382561 is 165283196996.

699691382561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 670811778961 + 28879603600 = 819031^2 + 169940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-699691382561 is a prime.

It is not a weakly prime, because it can be changed into another prime (699691382461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349845691280 + 349845691281.

It is an arithmetic number, because the mean of its divisors is an integer number (349845691281).

Almost surely, 2^699691382561 is an apocalyptic number.

It is an amenable number.

699691382561 is a deficient number, since it is larger than the sum of its proper divisors (1).

699691382561 is an equidigital number, since it uses as much as digits as its factorization.

699691382561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37791360, while the sum is 65.

The spelling of 699691382561 in words is "six hundred ninety-nine billion, six hundred ninety-one million, three hundred eighty-two thousand, five hundred sixty-one".