698763955621 has 2 divisors, whose sum is σ = 698763955622. Its totient is φ = 698763955620.

The previous prime is 698763955559. The next prime is 698763955633. The reversal of 698763955621 is 126559367896.

698763955621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 653371522596 + 45392433025 = 808314^2 + 213055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-698763955621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (698763953621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349381977810 + 349381977811.

It is an arithmetic number, because the mean of its divisors is an integer number (349381977811).

Almost surely, 2^698763955621 is an apocalyptic number.

It is an amenable number.

698763955621 is a deficient number, since it is larger than the sum of its proper divisors (1).

698763955621 is an equidigital number, since it uses as much as digits as its factorization.

698763955621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 146966400, while the sum is 67.

The spelling of 698763955621 in words is "six hundred ninety-eight billion, seven hundred sixty-three million, nine hundred fifty-five thousand, six hundred twenty-one".