698966557 has 2 divisors, whose sum is σ = 698966558. Its totient is φ = 698966556.

The previous prime is 698966531. The next prime is 698966621. The reversal of 698966557 is 755669896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 697540921 + 1425636 = 26411^2 + 1194^2 .

It is a cyclic number.

It is not a de Polignac number, because 698966557 - 2¹¹ = 698964509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 698966495 and 698966504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (698966057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349483278 + 349483279.

It is an arithmetic number, because the mean of its divisors is an integer number (349483279).

Almost surely, 2^698966557 is an apocalyptic number.

It is an amenable number.

698966557 is a deficient number, since it is larger than the sum of its proper divisors (1).

698966557 is an equidigital number, since it uses as much as digits as its factorization.

698966557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24494400, while the sum is 61.

The square root of 698966557 is about 26437.9756600236. The cubic root of 698966557 is about 887.4668350233.

The spelling of 698966557 in words is "six hundred ninety-eight million, nine hundred sixty-six thousand, five hundred fifty-seven".